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Axle coupler — Parallax Forums

Axle coupler

ArchiverArchiver Posts: 46,084
edited 2003-04-25 03:55 in General Discussion
Hi. This is only remotely stamp related...but I'm not sure where
else to ask.

Right now I'm working on a home built linear actuator. I've
purchased some stepper motors and a stepper controller that I'll be
controlling with my computer through a bs2. I've run into a problem,
however: The stats on the motors listed their shaft diameters
as .250", however they're actually .275". I'm trying to join these
to a .250" diameter threaded rod. The axle couplers I purchased
don't fit the motor shafts. I tried drilling one of the bores out,
but I botched the attempt and didn't get the enlarged hole dead
center, which causes an eccentric action...

This is a learning project for me, so any suggestions would be
welcome. I've searched mcmaster-carr and sdp-si, but for the life of
me, I can't seem to find anything with a .275" bore size.

Just as a side note, this is all for a neat little project of mine.
I purchased a safe, and forgot the combination. It's a pushbutton
combo entry, so instead of calling the safe company for a solution,
for fun (and education) I'm building a system using the stamp, my
computer, steppers, etc. to try all the possible combinations.

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-04-22 19:49
    Might see if someone is down in your area that has access to a lathe -- we
    often have to machine adapters for our stuff because things aren't always
    the correct size.

    I'm guessing the shaft is probably 7mm -- which is about 0.275.

    Original Message

    > Hi. This is only remotely stamp related...but I'm not sure where
    > else to ask.
    >
    > Right now I'm working on a home built linear actuator. I've
    > purchased some stepper motors and a stepper controller that I'll be
    > controlling with my computer through a bs2. I've run into a problem,
    > however: The stats on the motors listed their shaft diameters
    > as .250", however they're actually .275". I'm trying to join these
    > to a .250" diameter threaded rod. The axle couplers I purchased
    > don't fit the motor shafts. I tried drilling one of the bores out,
    > but I botched the attempt and didn't get the enlarged hole dead
    > center, which causes an eccentric action...
    >
    > This is a learning project for me, so any suggestions would be
    > welcome. I've searched mcmaster-carr and sdp-si, but for the life of
    > me, I can't seem to find anything with a .275" bore size.
    >
    > Just as a side note, this is all for a neat little project of mine.
    > I purchased a safe, and forgot the combination. It's a pushbutton
    > combo entry, so instead of calling the safe company for a solution,
    > for fun (and education) I'm building a system using the stamp, my
    > computer, steppers, etc. to try all the possible combinations.
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-23 14:43
    Since it sounds as though you don't need a lot of coupling torque, you
    might be able to get away with a piece of poly-vinyl tubing.

    >Hi. This is only remotely stamp related...but I'm not sure where
    >else to ask.
    >
    >Right now I'm working on a home built linear actuator. I've
    >purchased some stepper motors and a stepper controller that I'll be
    >controlling with my computer through a bs2. I've run into a problem,
    >however: The stats on the motors listed their shaft diameters
    >as .250", however they're actually .275". I'm trying to join these
    >to a .250" diameter threaded rod. The axle couplers I purchased
    >don't fit the motor shafts. I tried drilling one of the bores out,
    >but I botched the attempt and didn't get the enlarged hole dead
    >center, which causes an eccentric action...
    >
    >This is a learning project for me, so any suggestions would be
    >welcome. I've searched mcmaster-carr and sdp-si, but for the life of
    >me, I can't seem to find anything with a .275" bore size.
    >
    >Just as a side note, this is all for a neat little project of mine.
    >I purchased a safe, and forgot the combination. It's a pushbutton
    >combo entry, so instead of calling the safe company for a solution,
    >for fun (and education) I'm building a system using the stamp, my
    >computer, steppers, etc. to try all the possible combinations.
    >
    >
    >To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    >from the same email address that you subscribed. Text in the Subject and
    >Body of the message will be ignored.
    >
    >
    >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-24 02:20
    sounds like the shaft is 7 mm. you should be able to get a shaft
    coupling for that size.

    If you have a drll press, drill the hole for that tap, then the 7mm
    hole half way, then tap the hole. that should give you clearance.
    if you have a lathe, you can make it dead center.

    A less clean way would be to buy a threaded rod coupling nut. that
    would be threaded all the way thry and it would be long. then you
    can drill the center out. again, a drill press would be best. and
    in this case, I'd clamp the drill in a vice and put the nut in the
    drill press chuck. seems it would drill straighter that way.

    just a thought.

    Dave




    --- In basicstamps@yahoogroups.com, "Beau Schwabe" <bschwabe@a...>
    wrote:
    > Since it sounds as though you don't need a lot of coupling torque,
    you
    > might be able to get away with a piece of poly-vinyl tubing.
    >
    > >Hi. This is only remotely stamp related...but I'm not sure where
    > >else to ask.
    > >
    > >Right now I'm working on a home built linear actuator. I've
    > >purchased some stepper motors and a stepper controller that I'll be
    > >controlling with my computer through a bs2. I've run into a
    problem,
    > >however: The stats on the motors listed their shaft diameters
    > >as .250", however they're actually .275". I'm trying to join these
    > >to a .250" diameter threaded rod. The axle couplers I purchased
    > >don't fit the motor shafts. I tried drilling one of the bores out,
    > >but I botched the attempt and didn't get the enlarged hole dead
    > >center, which causes an eccentric action...
    > >
    > >This is a learning project for me, so any suggestions would be
    > >welcome. I've searched mcmaster-carr and sdp-si, but for the life
    of
    > >me, I can't seem to find anything with a .275" bore size.
    > >
    > >Just as a side note, this is all for a neat little project of mine.
    > >I purchased a safe, and forgot the combination. It's a pushbutton
    > >combo entry, so instead of calling the safe company for a solution,
    > >for fun (and education) I'm building a system using the stamp, my
    > >computer, steppers, etc. to try all the possible combinations.
    > >
    > >
    > >To UNSUBSCRIBE, just send mail to:
    > > basicstamps-unsubscribe@yahoogroups.com
    > >from the same email address that you subscribed. Text in the
    Subject and
    > >Body of the message will be ignored.
    > >
    > >
    > >Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-24 20:04
    Thanks guys. Since I don't have a lathe (this is really making me
    think of buying one...where to put it?!), but I do have a drill
    press, is there a good technique of centering the drill bit? I also
    worry about ensuring a cylinder is accurately vertically aligned in
    the vice. I won't be able to put the coupler in the chuck. It's
    just too big.

    I guess I could try to drill/tap set screws into a coupling nut?

    Harrumph. I may just go buy a lathe!

    I'll post a link to images of the contraption in operation once I get
    it done. At this rate that'll be a while :P

    --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
    wrote:
    > sounds like the shaft is 7 mm. you should be able to get a shaft
    > coupling for that size.
    >
    > If you have a drll press, drill the hole for that tap, then the 7mm
    > hole half way, then tap the hole. that should give you clearance.
    > if you have a lathe, you can make it dead center.
    >
    > A less clean way would be to buy a threaded rod coupling nut. that
    > would be threaded all the way thry and it would be long. then you
    > can drill the center out. again, a drill press would be best. and
    > in this case, I'd clamp the drill in a vice and put the nut in the
    > drill press chuck. seems it would drill straighter that way.
    >
    > just a thought.
    >
    > Dave
    >
    >
    >
    >
    > --- In basicstamps@yahoogroups.com, "Beau Schwabe" <bschwabe@a...>
    > wrote:
    > > Since it sounds as though you don't need a lot of coupling
    torque,
    > you
    > > might be able to get away with a piece of poly-vinyl tubing.
    > >
    > > >Hi. This is only remotely stamp related...but I'm not sure where
    > > >else to ask.
    > > >
    > > >Right now I'm working on a home built linear actuator. I've
    > > >purchased some stepper motors and a stepper controller that I'll
    be
    > > >controlling with my computer through a bs2. I've run into a
    > problem,
    > > >however: The stats on the motors listed their shaft diameters
    > > >as .250", however they're actually .275". I'm trying to join
    these
    > > >to a .250" diameter threaded rod. The axle couplers I purchased
    > > >don't fit the motor shafts. I tried drilling one of the bores
    out,
    > > >but I botched the attempt and didn't get the enlarged hole dead
    > > >center, which causes an eccentric action...
    > > >
    > > >This is a learning project for me, so any suggestions would be
    > > >welcome. I've searched mcmaster-carr and sdp-si, but for the
    life
    > of
    > > >me, I can't seem to find anything with a .275" bore size.
    > > >
    > > >Just as a side note, this is all for a neat little project of
    mine.
    > > >I purchased a safe, and forgot the combination. It's a
    pushbutton
    > > >combo entry, so instead of calling the safe company for a
    solution,
    > > >for fun (and education) I'm building a system using the stamp, my
    > > >computer, steppers, etc. to try all the possible combinations.
    > > >
    > > >
    > > >To UNSUBSCRIBE, just send mail to:
    > > > basicstamps-unsubscribe@yahoogroups.com
    > > >from the same email address that you subscribed. Text in the
    > Subject and
    > > >Body of the message will be ignored.
    > > >
    > > >
    > > >Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-24 21:00
    Get a two piece clamp on coupler to fit your larger shaft (.275?) and use
    .012 shim stock to bush your smaller shaft (.250). Or you can mail the part
    to me and I will open it up on a lathe [noparse]:)[/noparse]

    Contact me off list if you want me to turn it for you. I live in North
    Florida.

    Jeff

    Original Message
    From: verygrimm2 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Czy29UnmaQkfTf0xWO18_PtY38uyXNqAF7veFZ9Yl5qXvGJ_5IV0opZ5vsKvHtQDk6Iw9tFKWEnusP4L35AxvVJH]robots@t...[/url
    Sent: Thursday, April 24, 2003 3:05 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: Axle coupler

    Thanks guys. Since I don't have a lathe (this is really making me
    think of buying one...where to put it?!), but I do have a drill
    press, is there a good technique of centering the drill bit? I also
    worry about ensuring a cylinder is accurately vertically aligned in
    the vice. I won't be able to put the coupler in the chuck. It's
    just too big.

    I guess I could try to drill/tap set screws into a coupling nut?

    Harrumph. I may just go buy a lathe!

    I'll post a link to images of the contraption in operation once I get
    it done. At this rate that'll be a while :P

    --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
    wrote:
    > sounds like the shaft is 7 mm. you should be able to get a shaft
    > coupling for that size.
    >
    > If you have a drll press, drill the hole for that tap, then the 7mm
    > hole half way, then tap the hole. that should give you clearance.
    > if you have a lathe, you can make it dead center.
    >
    > A less clean way would be to buy a threaded rod coupling nut. that
    > would be threaded all the way thry and it would be long. then you
    > can drill the center out. again, a drill press would be best. and
    > in this case, I'd clamp the drill in a vice and put the nut in the
    > drill press chuck. seems it would drill straighter that way.
    >
    > just a thought.
    >
    > Dave
    >
    >
    >
    >
    > --- In basicstamps@yahoogroups.com, "Beau Schwabe" <bschwabe@a...>
    > wrote:
    > > Since it sounds as though you don't need a lot of coupling
    torque,
    > you
    > > might be able to get away with a piece of poly-vinyl tubing.
    > >
    > > >Hi. This is only remotely stamp related...but I'm not sure where
    > > >else to ask.
    > > >
    > > >Right now I'm working on a home built linear actuator. I've
    > > >purchased some stepper motors and a stepper controller that I'll
    be
    > > >controlling with my computer through a bs2. I've run into a
    > problem,
    > > >however: The stats on the motors listed their shaft diameters
    > > >as .250", however they're actually .275". I'm trying to join
    these
    > > >to a .250" diameter threaded rod. The axle couplers I purchased
    > > >don't fit the motor shafts. I tried drilling one of the bores
    out,
    > > >but I botched the attempt and didn't get the enlarged hole dead
    > > >center, which causes an eccentric action...
    > > >
    > > >This is a learning project for me, so any suggestions would be
    > > >welcome. I've searched mcmaster-carr and sdp-si, but for the
    life
    > of
    > > >me, I can't seem to find anything with a .275" bore size.
    > > >
    > > >Just as a side note, this is all for a neat little project of
    mine.
    > > >I purchased a safe, and forgot the combination. It's a
    pushbutton
    > > >combo entry, so instead of calling the safe company for a
    solution,
    > > >for fun (and education) I'm building a system using the stamp, my
    > > >computer, steppers, etc. to try all the possible combinations.
    > > >
    > > >
    > > >To UNSUBSCRIBE, just send mail to:
    > > > basicstamps-unsubscribe@yahoogroups.com
    > > >from the same email address that you subscribed. Text in the
    > Subject and
    > > >Body of the message will be ignored.
    > > >
    > > >
    > > >Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/


    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
    from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.


    Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-24 22:00
    Find a drill bit that will barely go through the center. Chuck that bit in
    the press and slide the coupling on it. Lower the spindle till the coupling
    is in the vise. Now it's lined up. Clamp part, and vise retract spindle
    and replace bit with the size you want. Drill away.

    Original Message
    From: verygrimm2 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=XzgTHF5g76V8Vh8jxynON-Bhn_e2sSSGFjfZNSXSlP2Fq5gaBQmAovwACF3gby-ZG3F6zu3ABlRnp3DHUr3rXw]robots@t...[/url
    Sent: Thursday, April 24, 2003 3:05 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: Axle coupler

    Thanks guys. Since I don't have a lathe (this is really making me
    think of buying one...where to put it?!), but I do have a drill
    press, is there a good technique of centering the drill bit? I also
    worry about ensuring a cylinder is accurately vertically aligned in
    the vice. I won't be able to put the coupler in the chuck. It's
    just too big.

    I guess I could try to drill/tap set screws into a coupling nut?

    Harrumph. I may just go buy a lathe!

    I'll post a link to images of the contraption in operation once I get
    it done. At this rate that'll be a while :P

    --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
    wrote:
    > sounds like the shaft is 7 mm. you should be able to get a shaft
    > coupling for that size.
    >
    > If you have a drll press, drill the hole for that tap, then the 7mm
    > hole half way, then tap the hole. that should give you clearance.
    > if you have a lathe, you can make it dead center.
    >
    > A less clean way would be to buy a threaded rod coupling nut. that
    > would be threaded all the way thry and it would be long. then you
    > can drill the center out. again, a drill press would be best. and
    > in this case, I'd clamp the drill in a vice and put the nut in the
    > drill press chuck. seems it would drill straighter that way.
    >
    > just a thought.
    >
    > Dave
    >
    >
    >
    >
    > --- In basicstamps@yahoogroups.com, "Beau Schwabe" <bschwabe@a...>
    > wrote:
    > > Since it sounds as though you don't need a lot of coupling
    torque,
    > you
    > > might be able to get away with a piece of poly-vinyl tubing.
    > >
    > > >Hi. This is only remotely stamp related...but I'm not sure where
    > > >else to ask.
    > > >
    > > >Right now I'm working on a home built linear actuator. I've
    > > >purchased some stepper motors and a stepper controller that I'll
    be
    > > >controlling with my computer through a bs2. I've run into a
    > problem,
    > > >however: The stats on the motors listed their shaft diameters
    > > >as .250", however they're actually .275". I'm trying to join
    these
    > > >to a .250" diameter threaded rod. The axle couplers I purchased
    > > >don't fit the motor shafts. I tried drilling one of the bores
    out,
    > > >but I botched the attempt and didn't get the enlarged hole dead
    > > >center, which causes an eccentric action...
    > > >
    > > >This is a learning project for me, so any suggestions would be
    > > >welcome. I've searched mcmaster-carr and sdp-si, but for the
    life
    > of
    > > >me, I can't seem to find anything with a .275" bore size.
    > > >
    > > >Just as a side note, this is all for a neat little project of
    mine.
    > > >I purchased a safe, and forgot the combination. It's a
    pushbutton
    > > >combo entry, so instead of calling the safe company for a
    solution,
    > > >for fun (and education) I'm building a system using the stamp, my
    > > >computer, steppers, etc. to try all the possible combinations.
    > > >
    > > >
    > > >To UNSUBSCRIBE, just send mail to:
    > > > basicstamps-unsubscribe@yahoogroups.com
    > > >from the same email address that you subscribed. Text in the
    > Subject and
    > > >Body of the message will be ignored.
    > > >
    > > >
    > > >Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/


    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
    from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.


    Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/



    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-25 03:52
    If you are not in a hurry, contact me off list.

    I have a lathe and would be happy to do it for you.

    Dave




    --- In basicstamps@yahoogroups.com, "verygrimm2" <robots@t...> wrote:
    > Thanks guys. Since I don't have a lathe (this is really making me
    > think of buying one...where to put it?!), but I do have a drill
    > press, is there a good technique of centering the drill bit? I
    also
    > worry about ensurin


    g a cylinder is accurately vertically aligned in
    > the vice. I won't be able to put the coupler in the chuck. It's
    > just too big.
    >
    > I guess I could try to drill/tap set screws into a coupling nut?
    >
    > Harrumph. I may just go buy a lathe!
    >
    > I'll post a link to images of the contraption in operation once I
    get
    > it done. At this rate that'll be a while :P
    >
    > --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
    > wrote:
    > > sounds like the shaft is 7 mm. you should be able to get a shaft
    > > coupling for that size.
    > >
    > > If you have a drll press, drill the hole for that tap, then the
    7mm
    > > hole half way, then tap the hole. that should give you
    clearance.
    > > if you have a lathe, you can make it dead center.
    > >
    > > A less clean way would be to buy a threaded rod coupling nut.
    that
    > > would be threaded all the way thry and it would be long. then
    you
    > > can drill the center out. again, a drill press would be best.
    and
    > > in this case, I'd clamp the drill in a vice and put the nut in
    the
    > > drill press chuck. seems it would drill straighter that way.
    > >
    > > just a thought.
    > >
    > > Dave
    > >
    > >
    > >
    > >
    > > --- In basicstamps@yahoogroups.com, "Beau Schwabe"
    <bschwabe@a...>
    > > wrote:
    > > > Since it sounds as though you don't need a lot of coupling
    > torque,
    > > you
    > > > might be able to get away with a piece of poly-vinyl tubing.
    > > >
    > > > >Hi. This is only remotely stamp related...but I'm not sure
    where
    > > > >else to ask.
    > > > >
    > > > >Right now I'm working on a home built linear actuator. I've
    > > > >purchased some stepper motors and a stepper controller that
    I'll
    > be
    > > > >controlling with my computer through a bs2. I've run into a
    > > problem,
    > > > >however: The stats on the motors listed their shaft diameters
    > > > >as .250", however they're actually .275". I'm trying to join
    > these
    > > > >to a .250" diameter threaded rod. The axle couplers I
    purchased
    > > > >don't fit the motor shafts. I tried drilling one of the bores
    > out,
    > > > >but I botched the attempt and didn't get the enlarged hole dead
    > > > >center, which causes an eccentric action...
    > > > >
    > > > >This is a learning project for me, so any suggestions would be
    > > > >welcome. I've searched mcmaster-carr and sdp-si, but for the
    > life
    > > of
    > > > >me, I can't seem to find anything with a .275" bore size.
    > > > >
    > > > >Just as a side note, this is all for a neat little project of
    > mine.
    > > > >I purchased a safe, and forgot the combination. It's a
    > pushbutton
    > > > >combo entry, so instead of calling the safe company for a
    > solution,
    > > > >for fun (and education) I'm building a system using the stamp,
    my
    > > > >computer, steppers, etc. to try all the possible combinations.
    > > > >
    > > > >
    > > > >To UNSUBSCRIBE, just send mail to:
    > > > > basicstamps-unsubscribe@yahoogroups.com
    > > > >from the same email address that you subscribed. Text in the
    > > Subject and
    > > > >Body of the message will be ignored.
    > > > >
    > > > >
    > > > >Your use of Yahoo! Groups is subject to
    > > http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2003-04-25 03:55
    I live in NJ, so you can send it to me if that is closer.

    if you are on the other side of the Missisppi, it may be faster in
    Fla as I'm at the shop only a few days a week.

    Dave


    --- In basicstamps@yahoogroups.com, "Jeff Mitchell" <JMitchell@G...>
    wrote:
    > Get a two piece clamp on coupler to fit your larger shaft (.275?)
    and use
    > .012 shim stock to bush your smaller shaft (.250). Or you can mail
    the part
    > to me and I will open it up on a lathe [noparse]:)[/noparse]
    >
    > Contact me off list if you want me to turn it for you. I live in
    North
    > Florida.
    >
    > Jeff
    >
    >
    Original Message
    > From: verygrimm2 [noparse][[/noparse]mailto:robots@t...]
    > Sent: Thursday, April 24, 2003 3:05 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Re: Axle coupler
    >
    > Thanks guys. Since I don't have a lathe (this is really making me
    > think of buying one...where to put it?!), but I do have a drill
    > press, is there a good technique of centering the drill bit? I also
    > worry about ensuring a cylinder is accurately vertically aligned in
    > the vice. I won't be able to put the coupler in the chuck. It's
    > just too big.
    >
    > I guess I could try to drill/tap set screws into a coupling nut?
    >
    > Harrumph. I may just go buy a lathe!
    >
    > I'll post a link to images of the contraption in operation once I
    get
    > it done. At this rate that'll be a while :P
    >
    > --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
    > wrote:
    > > sounds like the shaft is 7 mm. you should be able to get a shaft
    > > coupling for that size.
    > >
    > > If you have a drll press, drill the hole for that tap, then the
    7mm
    > > hole half way, then tap the hole. that should give you clearance.
    > > if you have a lathe, you can make it dead center.
    > >
    > > A less clean way would be to buy a threaded rod coupling nut.
    that
    > > would be threaded all the way thry and it would be long. then you
    > > can drill the center out. again, a drill press would be best.
    and
    > > in this case, I'd clamp the drill in a vice and put the nut in the
    > > drill press chuck. seems it would drill straighter that way.
    > >
    > > just a thought.
    > >
    > > Dave
    > >
    > >
    > >
    > >
    > > --- In basicstamps@yahoogroups.com, "Beau Schwabe" <bschwabe@a...>
    > > wrote:
    > > > Since it sounds as though you don't need a lot of coupling
    > torque,
    > > you
    > > > might be able to get away with a piece of poly-vinyl tubing.
    > > >
    > > > >Hi. This is only remotely stamp related...but I'm not sure
    where
    > > > >else to ask.
    > > > >
    > > > >Right now I'm working on a home built linear actuator. I've
    > > > >purchased some stepper motors and a stepper controller that
    I'll
    > be
    > > > >controlling with my computer through a bs2. I've run into a
    > > problem,
    > > > >however: The stats on the motors listed their shaft diameters
    > > > >as .250", however they're actually .275". I'm trying to join
    > these
    > > > >to a .250" diameter threaded rod. The axle couplers I
    purchased
    > > > >don't fit the motor shafts. I tried drilling one of the bores
    > out,
    > > > >but I botched the attempt and didn't get the enlarged hole dead
    > > > >center, which causes an eccentric action...
    > > > >
    > > > >This is a learning project for me, so any suggestions would be
    > > > >welcome. I've searched mcmaster-carr and sdp-si, but for the
    > life
    > > of
    > > > >me, I can't seem to find anything with a .275" bore size.
    > > > >
    > > > >Just as a side note, this is all for a neat little project of
    > mine.
    > > > >I purchased a safe, and forgot the combination. It's a
    > pushbutton
    > > > >combo entry, so instead of calling the safe company for a
    > solution,
    > > > >for fun (and education) I'm building a system using the stamp,
    my
    > > > >computer, steppers, etc. to try all the possible combinations.
    > > > >
    > > > >
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    > > > >from the same email address that you subscribed. Text in the
    > > Subject and
    > > > >Body of the message will be ignored.
    > > > >
    > > > >
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    >
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