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Screw details

bwilliamsbwilliams Posts: 14
edited 2014-08-05 02:06 in General Discussion
Hi,

I am using the aluminium motor mounts from the wheel kit and I need to extend the height which is fine - the challenge is that I need to get new screws that will fit the thread of the motor mounts.

Can someone please provide me with the thread details, size etc.

Cheers,

Brennon

Comments

  • GenetixGenetix Posts: 1,754
    edited 2014-08-04 07:13
    I am guessing you mean this one
    http://www.parallax.com/sites/default/files/downloads/28962-Motor-Mount-Wheel-Kit-AL-MP-Product-Guide-v1.0.pdf

    On page 11 it says 1/4-20 drilled to 0.600"

    Full product page
    http://www.parallax.com/product/28962
  • bwilliamsbwilliams Posts: 14
    edited 2014-08-04 07:33
    Hi,

    Yes I used those details and ordered some precision screws that suggest a slightly different thread detail.

    When converted to metric, you get a size of M6, but there are two sizes that are based on course (M6 x1) and fine (M6 x 0.75) - My preference is to not have to tap the hole, just thought someone may have had more accurate details.

    Thanks for the help.

    Cheers
  • Matt GillilandMatt Gilliland Posts: 1,406
    edited 2014-08-04 07:42
    Hi bwilliams-
    Yes, the aluminum version is tapped for 1/4"-20 (threads per inch). The HDPE (Plastic version) is not tapped but is designed to allow you to drive a screw (of appropriate diameter) into it and cut it's own threads. So this means that you can just choose a screw that is slightly larger than the hole and drive it in for a snug fit.
    -MattG
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-08-04 10:29
    Ah yes, the USA continues to refuse to go metric.

    Here in Taiwan, half the automotive is metric and half is not. So the screws for both are available. But much of the world is not so schizophrenic.

    I guess that is why the world has gone over to those inelegant self-tapping screws for all and everything.

    I love the title to the thread, how ironic and clever.
  • GenetixGenetix Posts: 1,754
    edited 2014-08-04 11:39
    Brennon,

    Aluminum is very easy to cross-thread so make sure those metric screws you are getting have the correct pitch and diameter.
    1/4-20 is a very common size here in the US so hopefully they are not too difficult to get.

    Loopy, don't forget that Aluminum is usually anodized to protect it and as I told Brennon it's also easily cross-threaded. I remember having always to move to the next size up because the holes would get stripped if tightened too much.
  • bwilliamsbwilliams Posts: 14
    edited 2014-08-05 02:06
    Thanks for the reply guys. It turns out that my supplier sent me an M6 screw with 25 threads per inch, so they are sending me the 20 threads which should sort this.

    Very much appreciate the advice on tapping the holes, as this was an alternative that I was looking at also.

    Thanks again all.

    Cheers,
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