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Thread: 17 tpi thread
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27th Jan 2020, 09:54 PM #1Most Valued Member
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17 tpi thread
hi every one . is it possible to cut a 17 tpi thread on a hercus c . An imperial modal
what change gears are required?
aaron
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28th Jan 2020, 12:29 AM #2Golden Member
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Do you have a 127T metric conversion gear for the lathe? That's awfully close to 1.5 mm pitch (1.494 mm), or is that what you are actually trying to cut?
Frank.
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28th Jan 2020, 11:29 AM #3Most Valued Member
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1.5 mm pitch
hi frank . Thanks and Yes you got it. I was thinking about cutting a 1.5mm thread. I dont have the 127 tooth change gear. Ill have a play around with the gears i have all ready and see how close i can get.
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28th Jan 2020, 12:54 PM #4Golden Member
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[QUOTE=azzrock;1962284]hi frank . Thanks and Yes you got it. I was thinking about cutting a 1.5mm thread. I dont have the 127 tooth change gear. Ill have a play around with the gears i have all ready and see how close i can get.[/Qhttps://metalworkforums.com/f65/t118398-lathe-thread-cutting-change-gear-calculator/page-5?highlight=LathegearsUOTE]
https://metalworkforums.com/f65/t118...ght=Lathegears
a forum member called Vernonv wrote a fabulous little program for calculating gear trains. See above thread for download links.
You keyin your leadscrew TPI, your available gears, thread required (metric or imperial), gearbox ratios if you have one, acceptable tolerance ie + / - 0.2% and it will list the possible gear trains. Or alternately it will calculate what gear is missing and is required.
Bill
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28th Jan 2020, 01:31 PM #5Most Valued Member
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thanks
hi bill.
thanks. Im downloading it to my phone. Thanks for the tip.
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28th Jan 2020, 04:10 PM #6Senior Member
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Another possible approach is to 3D print the extra gears. I printed some PLA gears to allow me to cut 1.5mm on my very ancient Senecca Falls machine and they worked very, very well.
Here is a link to a metric conversion for a model A: https://www.thingiverse.com/thing:3352151
This uses a 60/63 transposing gear and there is a link there to a more precise 100/127 set if you need that accuracy - I know zip about the differences in Hercus models so hopefully of use?
Ray
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28th Jan 2020, 04:53 PM #7Most Valued Member
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brilliant
hi Ray .thanks for that idea. my best mate has a great 3d printer. We don't know how to make the patterns/or run the thing.
Is that link your work? i wonder what colour ill choose.
aaron
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28th Jan 2020, 06:42 PM #8Senior Member
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No, that is an online 3D printing sharing website - that has a series of .stl files for the various gears as created by the CAD software and they will need to be run through a 'slicer' program (CURA is an example of a free one) to create GCODE for the printer.
Have a bit of a search as there are hundreds of odds and ends that people have shared.
I'll drop you a PM as I'm just up the road in Werribee.
Ray
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28th Jan 2020, 07:23 PM #9Most Valued Member
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maybe
if i used a 24 80 and 52 tooth gear i wonder how close that will be///
I should just give it a try.
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28th Jan 2020, 07:24 PM #10Most Valued Member
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maybe
if i used a 24 80 and 52 tooth gear i wonder how close that will be///
I should just give it a try.
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28th Jan 2020, 08:22 PM #11Philomath in training
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I can't recall if a 127t gear would fit in a Hercus. I know there is at least one lathe around that size that uses a 63/60 combination because of the fit issue. If you have the gear details I could cut you one.
Michael
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28th Jan 2020, 11:52 PM #12Most Valued Member
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63/60
hi Micheal,
thanks for the tip and the offer to cut me a gear. Im not sure what Im going to do yet.
aaron
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29th Jan 2020, 07:22 AM #13Most Valued Member
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The 52 will give you around .001" difference in pitch per thread, a 51 would be preferred.
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30th Jan 2020, 08:28 PM #14Most Valued Member
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1st Feb 2020, 12:23 AM #15Most Valued Member
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gear cutter
hi is this a suitable gear cutter for hercus change gears
thanks
Attachment 384510
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