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March 25, 2017, 21:32:23 pm


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Author Topic: CNC Gear wheel milling with A axis on 6040Z router  (Read 1098 times)
Bubba
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« Reply #15 on: January 02, 2017, 23:50:16 pm »

I did misunderstood what you were saying Lloyd. I applying your explanation to my situation where my rotary axis use a worm gear setup and although there is little backlash by keeping rotation in one direction it gives pretty good results..
Here is old video of it working. It was done way before the router was upgraded.

https://www.youtube.com/watch?v=t4w0qaEOizI
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Garyhlucas
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« Reply #16 on: January 03, 2017, 03:25:45 am »

Lloyd,
I think what you are saying would improve the gear accuracy. Wrap a cord around the arbor a dozen turns, over a pulley at the edge of the bench and hang a weight on it for anti-backlash preload.

In Manufacturing Engineering magazine there was as article on CNC gear cutting using a 20 degree V cutter and forming perfect involute teeth by using coordinated motion of the A axis with Z axis. Any pitch, any number of teeth with one tool. It could even be a single point lathe type cutter, just slower. 

Lots more code, just the kind of thing you'd do with CamBam!
That sounds very interesting do you have a link to the article or can you scan it please.

Couldn't find the article but this guys youtube video explains it.

Generative gear cutting with a very simple tool (on a CNC with EMC2)
MuellerNick 52,677 views
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Gary H. Lucas

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SteveT
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« Reply #17 on: January 03, 2017, 09:22:35 am »

Lloyd,
I think what you are saying would improve the gear accuracy. Wrap a cord around the arbor a dozen turns, over a pulley at the edge of the bench and hang a weight on it for anti-backlash preload.

In Manufacturing Engineering magazine there was as article on CNC gear cutting using a 20 degree V cutter and forming perfect involute teeth by using coordinated motion of the A axis with Z axis. Any pitch, any number of teeth with one tool. It could even be a single point lathe type cutter, just slower. 

Lots more code, just the kind of thing you'd do with CamBam!
That sounds very interesting do you have a link to the article or can you scan it please.

Couldn't find the article but this guys youtube video explains it.

Generative gear cutting with a very simple tool (on a CNC with EMC2)
MuellerNick 52,677 views
1192
Thanks for sharing the video it looks an interesting concept but very slow. To get away from buying expensive cycloidal cutters I have started trying to making multi tooth cutters the first one worked okay but needs some improvement.
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quoy25
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« Reply #18 on: January 03, 2017, 17:32:57 pm »

after searching with google i find the link :

https://youtu.be/SJQtx80euGM

the problem is that this is "archéological" gearwheel milling , probably from "cromagnon" age and without any doubt need hours and hours to make a simple pinion with very specific machine Out of reach of a hobyist. Grin

for those who do not know "myfordboy" , here is a nice video showing how to make both parts of a worm wheel with a simple lathe .

https://www.youtube.com/watch?v=-umcQtrn1CQ





« Last Edit: January 03, 2017, 17:37:44 pm by quoy25 » Logged
SteveT
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« Reply #19 on: January 03, 2017, 18:25:48 pm »

after searching with google i find the link :

https://youtu.be/SJQtx80euGM

the problem is that this is "archéological" gearwheel milling , probably from "cromagnon" age and without any doubt need hours and hours to make a simple pinion with very specific machine Out of reach of a hobyist. Grin

for those who do not know "myfordboy" , here is a nice video showing how to make both parts of a worm wheel with a simple lathe .

https://www.youtube.com/watch?v=-umcQtrn1CQ






I like the worm gear hobbing looks a good method, thanks for sharing
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lloydsp
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« Reply #20 on: January 03, 2017, 19:43:26 pm »

I'm not clear, though, on how the 'worm hub-diameter' arc was cut in the face of the gear.  There are no cutting teeth at the minor diameter of the hob, so how was that radius made?

I did not see that it was cut before the hobbing.

Lloyd
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Garyhlucas
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« Reply #21 on: January 04, 2017, 03:02:49 am »

after searching with google i find the link :

https://youtu.be/SJQtx80euGM

the problem is that this is "archéological" gearwheel milling , probably from "cromagnon" age and without any doubt need hours and hours to make a simple pinion with very specific machine Out of reach of a hobyist. Grin

for those who do not know "myfordboy" , here is a nice video showing how to make both parts of a worm wheel with a simple lathe .

https://www.youtube.com/watch?v=-umcQtrn1CQ







Actually this is method is being demonstrated here by a hobbyist but is actually being done for high tech gears in simple 4 axis CNC machines. It is slower, but not as much as you might think because modern CNC are so fast and modern coated carbides can also cut so fast. The method is being used for low production and one off gears or simply when you need it NOW!  I used to have customers where down time was more than 10,000 an hour. Get a replacement gear today? Oh yeah that works! Sandvik makes a whole line of insert cutters for this technique.
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Gary H. Lucas

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quoy25
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« Reply #22 on: January 04, 2017, 06:28:40 am »

an interesting video  resuming gear wheel machining methods :
https://youtu.be/B0XSsa79Y1w

and one demonstrating modern high volume pinion production (start of the video)
https://youtu.be/r1ek0nWD4k0
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SteveT
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« Reply #23 on: January 04, 2017, 09:04:13 am »

I'm not clear, though, on how the 'worm hub-diameter' arc was cut in the face of the gear.  There are no cutting teeth at the minor diameter of the hob, so how was that radius made?

I did not see that it was cut before the hobbing.

Lloyd
If I understand the question correctly the radius on the circumference of the gear is formed by the cutter in its first pass. As the axis of the wheel is at 90deg to the cutters rotational axis the outside diameter of the cutter will form the radius on the rim of the gear. I think :-)
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lloydsp
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« Reply #24 on: January 04, 2017, 14:04:11 pm »

I don't see how that would work.  The radius must match that of the minor diameter of the worm, and the only cutting teeth in that hob are on the major diameter.

Huh

LLoyd
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SteveT
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« Reply #25 on: January 04, 2017, 15:54:29 pm »

I don't see how that would work.  The radius must match that of the minor diameter of the worm, and the only cutting teeth in that hob are on the major diameter.

Huh

LLoyd
I agree but considering the method all you get is the major dia from the outside dia of the cutter and it is a diy method and I suppose okay for light duty.
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quoy25
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« Reply #26 on: January 04, 2017, 17:02:57 pm »

what is not explained in the video is that you have to machine the "worm" cutting tool according to the worm gear dimensions rules.
and make the worm real part  according to worm dimensions rules ( see picture joined for exemple)
in synthesis : 2 differens parts.

link for calculation site :  http://www.mitcalc.com/doc/gear4/help/en/gear4.htm


* worm wheel.jpg (72.33 KB, 598x472 - viewed 40 times.)

* worm gear 02.jpg (79.82 KB, 655x320 - viewed 47 times.)
« Last Edit: January 04, 2017, 17:30:15 pm by quoy25 » Logged
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