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Mixing Gear Module?

Thinking of building a gearbox

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Andy Carruthers14/03/2019 07:12:53
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197 forum posts
18 photos

I have a WM180 and dislike gear changing for cutting threads, there has to be a better way - and yes, this might be academic as I intend to purchase a bigger more comprehensively equipped lathe this year

On the WM180 within the gear train cover space is very limited, as an aside, moving the motor would help. Having looked on YouTube, some of the home-built gearboxes are substantial both in size and weight, which got me thinking

I know the WM180 uses Module 1 gears for the chuck drive, I wonder if I could gang a 40T Module 1 gear with a 40T Module 0.5 or 0.75 gear to reduce the physical gear size then reflect the new Module down the gear chain to the lead screw - I cannot see any great load issues but I might be missing something blindingly obvious, it has been known...

Robert Atkinson 214/03/2019 07:26:38
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135 forum posts
12 photos

The obvious answer to me is to ditch the gearbox and direct drive the leadscrew with a servo motor (or stepper) with a controller that is driven by pulses picked up from the headstock spindle (reluctance sensor off existing gear teeth or a new opto.). Any decent controller will be able to electronically gear the servo to the head at whatever ratio you need.

Then again I'm an electronics engineer.

Robert G8RPI.

Andy Carruthers14/03/2019 07:32:14
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197 forum posts
18 photos

Now that is a very appealing option, thanks Robert, blindingly obvious now you have mentioned it

Time to get my thinking cap on

Michael Gilligan14/03/2019 07:36:49
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12686 forum posts
551 photos

Andy,

I know next-to-nothing about the WM180, but the basic principle of what you propose is quite reasonable.

Martin Cleeve did this:

cleeve_dog_fig4.jpg

cleeve_dog_fig5.jpg

MichaelG.

Andy Carruthers14/03/2019 08:15:34
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197 forum posts
18 photos

Thanks Michael, I appreciate the confirmation

Martin Cleeve is indeed a very clever man!

I do have to seriously think about my approach, Robert's suggestion has the appeal of space saving, less machining and is non-machine specific in it's implementation, worthy of an article when I get my act together

HOWARDT14/03/2019 08:16:31
383 forum posts
14 photos

In answer to the original question, yes you can mix the module or dp, but obviously in pairs. One thing to bear in mind though that gear power and wear are proportional to the module and number of teeth. So if you had a gear in the train of 18T at 1 mod it would need to be 36T at 0.5 mod, unless you use a stronger material. Using different tooth sizes will enable you to get odd ratios probably in smaller sizes, I.e using 127T at 0.5mod.

John Pace14/03/2019 08:38:32
122 forum posts
121 photos

Myford .8 module change wheel set and Warco Gh 1000 1 module change wheels ,both keep within the machine covers.

John.8 mod 127 changewheel.jpg1 mod 127 changewheels.jpg

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