Thread: my build
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08-08-2009 #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).
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09-08-2009 #22
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
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19-09-2009 #23
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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29-11-2009 #24
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29-11-2009 #25
Umm - forgive me if I'm being a bit dumb - but with a ruler/micrometer?
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29-11-2009 #26
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
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29-11-2009 #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?
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29-11-2009 #28
hi tribbles
pitch from crown to crown 11mm , width at top of tooth 12mm, what is mod 1, mod 2.5 refering to
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29-11-2009 #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).
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29-11-2009 #30
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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