Thread: my build

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  1. #31
    jonm's Avatar
    Location unknown. Last Activity: 19-06-2011 Has been a member for 7-8 years. Has a total post count of 89.
    hi tribbles
    i am looking at this page http://www.ondrives.com/commercial-g...ype-steel.html looking down the mod column it relates to the width of the rack, the pitch line is down from the top of the tooth so measured down there i could have mod 1.5 .... i think .... maybe .....well i am getting confused with this

  2. #32
    Not sure why they've measured P based on the height, but that could be where they're measuring from (I am doing this from memory).

    I've got some mod 1.0 rack in the garage - I'll go and measure it - it should tally with what they've got.

  3. #33
    Just measured it - it's 3.15ish mm, so I'm willing to go with 3.14.

    Looking at this page (which I'd been to earlier):

    http://www.ondrives.com/precision-ge...ear-racks.html

    it sort of indicates that half the pitch is (pi * m / 2) - although the end marker isn't exactly where I would expect it.

    ETA: Looking at Kn8's document - reference pitch is pi * m, which is what I thought it was all along.

  4. #34
    The "P" is the reference pitch height - i.e. where you measure the pitch from.

  5. #35
    jonm's Avatar
    Location unknown. Last Activity: 19-06-2011 Has been a member for 7-8 years. Has a total post count of 89.
    hi tribbles
    will go and get the calipers to measure the rack

  6. #36
    Just had a thought about the meaning of the "P" value - this is actually the height at which the pitch diameter would ride at.

    So, if you had a 60mm diameter gear, and "P" was 10mm, then the centre of the gear would be 40mm from the base of the rack.

  7. #37
    jonm's Avatar
    Location unknown. Last Activity: 19-06-2011 Has been a member for 7-8 years. Has a total post count of 89.
    hi tribbles
    get 11mm pitch 3.1mm at the crown of the tooth
    and rack is 12mm wide , i am still confused cant seem to find anything similar, unless im measuring at the wrong place

  8. #38
    Going from crown to crown, then 11mm is near as damn it mod 3.5. However, I've not seen that many mod 3.5s.

    This seems to indicate this company makes them: http://www.rushgears.com/Tech_Tools/geargages.php

    I take it you didn't find any gears with it, did you...

  9. #39
    jonm's Avatar
    Location unknown. Last Activity: 19-06-2011 Has been a member for 7-8 years. Has a total post count of 89.
    hi
    tribbles yes you'r right it looks like mod 3.5
    no, no gears with it im afraid
    mod 3.5 looks hard to find

  10. #40
    jonm's Avatar
    Location unknown. Last Activity: 19-06-2011 Has been a member for 7-8 years. Has a total post count of 89.
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    v groove bearings arrived from ebay this morning, the t slots on the back of the beam just happen to be size for a 10mm bolt head...
    the x and y are rock solid much better than my first mdf creation
    apparently this ali beam came from a stenna stair lift 190mm x 90 no flex at all even after cutting out the middle section . screw will go through the middle of the beam , gives me 600mm on the y

    new trend t4 coming from santa for spindle...

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