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Just thought I would make a simple online Thread Cutting Change Gear Calculator
Uses number of teeth on each of the four gears and the leadscrew pitch - works with TPI and mm
Attachment 41249
Let me know if it is useful or you need other options or even calculators
Thanks for sharing, Nigel. Works great.
Note to Metric users: -Only remember to enter a decimal point (instad of a comma) for Metric leadscrew pitch.
My two cents: Personally I almost always need to know the change gear combo to reach (or nudge) my desired thread cutting pitch,
rather than the other way around: Enter all the gears to find out what pitch I'll get then.
Keep up the good work!
Johan
PS: I've thus far been satisfied with Dr Al's Mini Lathe Gear Calculator
(particularly when cutting Imperial threads on my Metric mini lathe, by just 3D print a few extra 21, 50 & 63 T gears):
https://www.cgtk.co.uk/metalwork/cal...ears/minilathe
Hello Johan,Quote:
Originally Posted by DIYSwede
Thanks for the feedback. Based on this I've added a change gear calculation sheet to my workshop calculations download (free download for all)
This now has a calculator as per the online page.
Plus a calculator where you enter the thread pitch you want to cut, the leadscrew pitch and then 3 gear options for each position on the gear train. This then calculates all combinations, highlighting the exact matches green and any with <2% ratio error in amber.
I need to perhaps write some more notes, but hope this helps.
Best regards, Nigel
A snapshot of the worksheet here:
Attachment 41260
Nigel:
Thank You for posting!!!
My 1908 Reed leaves me guessing most of the time. After a century of use the "standard gears are very worn or missing all togeather, so some very unusal combinations are required, and your varibles take the ?? out.
I hadn't thought of using "printed" gears can you suggest a particular grade/ type of plastic to use? How about aperson that has done gears sucessfully?
Many thanks,
2-hack
@2-hack : For me ordinary PLA gets the job done. YMMV.Quote:
Originally Posted by 2-hack
My page on this: https://www.homemadetools.net/forum/...187#post134683
Thanks Nigel for sharing!
ATB
Johan
I have been using 'Lathe Gears' by Vernon van D. for years and swear by it. You have to work out your gearbox ratios if not listed but worth the time. Amounst my all time favorites.
I have tried to upload the program but can't so here is the link: https://lathegears.software.informer.com/
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Thanks editor@glue-it.com! We've added your Thread Cutting Change Gear Calculator to our Machining category,
as well as to your builder page: editor@glue-it.com's Homemade Tools. Your receipt:
<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-thread-cutting-change-gear-calculator"> <img src="/uploads/252611/homemade-thread-cutting-change-gear-calculator.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/homemade-thread-cutting-change-gear-calculator">Thread Cutting Change Gear Calculator</a> <span> by <a href="https://www.homemadetools.net/builder/editor%40glue-it.com">editor@glue-it.com</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/threading'>threading</a> </div> </div> </div> </div>
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