Funny you should post this Bob...I was just looking at the spec sheet for the 2 I just bought to see what the shaft size is...It's 3mm.· So it would seem any Gear, Pulley or wheel designed for a 3mm shaft should work.· My only question is how to get the existing gear off, without damaging anything.· The previous stepper motors I used all had gears or pulleys with set screws...
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Chris Savage
Knight Designs 324 West Main Street P.O. Box 97 Montour Falls, NY 14865 (607) 535-6777
I think it's press-fit on the shaft...But I'd like to talk to someone from Parallax to be sure...Monday, I guess...Unless a tech catches this and answers it on the forum...
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Chris Savage
Knight Designs 324 West Main Street P.O. Box 97 Montour Falls, NY 14865 (607) 535-6777
You may need a 'gear puller'. Try a google search.
The following is a description, but I really this a picture is much better.
If you talk to an automotive or motorcycle mechanic, they usually have or rent one for the large gears and pulleys that are attached to shafts on the engines. They can show you a big one (useless for steppers, but useful for the concept).
It is basically an adjustible U-shaped device that can grab the gear under two sides, then a screw (like a C-clamp screw) pushes down on the shaft from the center of the U and eases the gear away from it.
To put on a new gear, you may need a small lever press or you can use a small hydrallic auto jack in box-like frame to push the new gear on. Hammering gears on is not really a very good way to go - lots of risks of misalignment and damage.
You really have to order the gears in matched sets as there are so many angles and sizes to teeth that you are likely to mis-measure.
Once you see a 'gear puller' you can begin to figure out many ways to make one.
Alternatively, you can grab the gear in a vise and use a small steel punch to hit the shaft and pound it out.
(but again -- this is risky, you may damage more than the gear)
Actually, I have a gear puller (Craftsman) for my Automotive tools...But as you said, it's not going to help me on a Stepper.· I will have to think of something that will work on that small of a shaft.· It's not a real priority right now...
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Chris Savage
Knight Designs 324 West Main Street P.O. Box 97 Montour Falls, NY 14865 (607) 535-6777
Comments
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Chris Savage
Knight Designs
324 West Main Street
P.O. Box 97
Montour Falls, NY 14865
(607) 535-6777
Business Page:·· http://www.knightdesigns.com
Personal Page:··· http://www.lightlink.com/dream/chris
·
NOTE-this trick wont work with certain types of glues so do dont get mad if it doesnt work.
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Chris Savage
Knight Designs
324 West Main Street
P.O. Box 97
Montour Falls, NY 14865
(607) 535-6777
Business Page:·· http://www.knightdesigns.com
Personal Page:··· http://www.lightlink.com/dream/chris
·
The following is a description, but I really this a picture is much better.
If you talk to an automotive or motorcycle mechanic, they usually have or rent one for the large gears and pulleys that are attached to shafts on the engines. They can show you a big one (useless for steppers, but useful for the concept).
It is basically an adjustible U-shaped device that can grab the gear under two sides, then a screw (like a C-clamp screw) pushes down on the shaft from the center of the U and eases the gear away from it.
To put on a new gear, you may need a small lever press or you can use a small hydrallic auto jack in box-like frame to push the new gear on. Hammering gears on is not really a very good way to go - lots of risks of misalignment and damage.
You really have to order the gears in matched sets as there are so many angles and sizes to teeth that you are likely to mis-measure.
Once you see a 'gear puller' you can begin to figure out many ways to make one.
Alternatively, you can grab the gear in a vise and use a small steel punch to hit the shaft and pound it out.
(but again -- this is risky, you may damage more than the gear)
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G. Herzog in Taiwan
Post Edited (Herzog) : 8/29/2004 5:49:54 AM GMT
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Chris Savage
Knight Designs
324 West Main Street
P.O. Box 97
Montour Falls, NY 14865
(607) 535-6777
Business Page:·· http://www.knightdesigns.com
Personal Page:··· http://www.lightlink.com/dream/chris
·
Perhaps a wheel/gear puller used by clock makers would work. A google search should find several. Good luck.
Sid A
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Chris Savage
Knight Designs
324 West Main Street
P.O. Box 97
Montour Falls, NY 14865
(607) 535-6777
Business Page:·· http://www.knightdesigns.com
Personal Page:··· http://www.lightlink.com/dream/chris
·