Thread: my build

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  1. #21
    That's quite impressive - I've tried that technique before (although only turning the ends of bolts), and I wasn't that successful.

    Mind you, I was using an electric drill as a lathe held in one hand, and the other hand holding the grinder I was also not really after precision (just wanted a nice chamfer on the end - it wasn't very neat, but did its job).

  2. #22
    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.
    tribbles
    i had the drill in a stand lying on its side and clamped to the bench, because the screw was held with bearings it was running true ... there was no whip in the screw

  3. #23
    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.
    been busy with work.. but found the time to to make a carridge for the gantry... made a mdf one to start...far to much flex so got out the mig pretty pleased with this one very ridgid
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  4. #24
    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
    went to local recycling yard today with some rubbish
    and found this alu Click image for larger version. 

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ID:	1200 its 180mm x 90mm
    this section is about 1200mm long , the other lenght is 5 meters
    long,
    (i see a big alu framed router) the bonus is the 6 meters of rack
    that was screwed to it, how do i determine the pitch of the rack

  5. #25
    Umm - forgive me if I'm being a bit dumb - but with a ruler/micrometer?

  6. #26
    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
    been looking on the net and find rack classed as mod 1
    mod 2.5 etc etc all with different pitches , where do i measure from
    the crown to crown of the tooth, because pitch line was talked about
    that was a line about halfway up the tooth

  7. #27
    I would've thought that as long as you measure from the same point in the rack, then that's okay.

    When I was looking at racks, I looked at the mod sizes, and then looked for rack that was equivalent to that size.

    What's the size you have?

  8. #28
    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
    pitch from crown to crown 11mm , width at top of tooth 12mm, what is mod 1, mod 2.5 refering to

  9. #29
    I'm not exactly sure what the mod setting is, but I think it's the ratio of the number of teeth to the diameter of the wheel.

    I know that generally mod 1.0 means for a 60mm wheel, you get 60 teeth; for a 120mm wheel, it's 120 teeth.

    So, mod 1.0 would have 3.14mm pitch (circumference = pi*dia, dia = 60, so 188.49 circumference. Divide by 60 gives pi).

    If it's 11mm, then it's probably 10.995, or mod 3.5 (3.5*pi = 10.995).

  10. #30
    Kn8's Avatar
    Location unknown. Last Activity: 10-11-2014 Has been a member for 7-8 years. Has a total post count of 58. Received thanks 1 times, giving thanks to others 0 times.
    Hi jonm have a look at http://www.khkgears.co.jp/en/gear_te...pdf/module.pdf hopfully this will make it a but move clear.

    Ivan.

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