I'm using a .0375D EM. The blank is .944D and there are 17 teeth. I looked under a magnifying lens at the old gear and the new gear does look thin. The information I have is that is the correct diameter and the CNC portion of the program doesn't have an issue with the .0375D EM The root measures at .070 which is more than the cutters width. It seems like the program is making the root wider than the bit and thus is thinning the teeth. While it's difficult to measure the old gear teeth at their widest point is ~.092 and the new gear measures ~.072. So you think I should increase the diameter? How much should I increase the diameter? You best guess is fine.
Thanks again
Dan
ArtF wrote:
Hi Dan:
The teeth on that gear look thinned ( but I cant see them clearly enough).. perhaps the bit is a touch too large in diameter..or the blank was a touch too small. ( The blank diameter is pretty sensitive and the tool diameter isnt great at reporting if its too large..
Glad to see its working though. I tihnk Im going to bump up the priority of a 4th axis simulator. As soon as the 2.5D workbench is out to
allow better 2.5D work, I think Ill do the new 4th axis. Seeing it work is the best diagnostic I think, most of us have trouble thinking
in 4th axis, so it'd be great to have a visual way to verify what we're doing..
In the cnc module I increased the EM size to .04 however the teeth are still thin and not quite right. Here are some pictures. I measured the root and it was still oversize in that the width of the new gear root was .078. The original gear root width is .06.
Any help is appreciated. BYW I can upload another video of this latest gear being machined.
Dan Mauch
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Last edited by SEOSearch [Crawler] on Wed Sep 10, 2014 6:00 pm, edited 1 time in total.
My apologies I just went out to double check the diameter of the end mill with my tenth mike and found that the cutter is .061D not.0375 . I most have forgot to zero my caliper when I first checked it.. I'll redo the G code and see if that works better.
dAN
Today I made a few changes and it looks like the 17tooth gear came out perfect. It meshes with no discernible backlash and there is clearance in the root. What do you think Art?
I plan to upload a video later today because I thing there are some things in the G code that you may want to take a look at. It seems like the X+ travel is excessive and the A axis at some point is really slow it took m35 minutes to machine a 20 IPM feed rate.
But overall this program is OUTSTANDING. And I can't thank you enough Art for all the help and for this great program.
Dan Mauch
BTW I post a link to the video later . My back was sore so I didn't want to lift my 8" rotary table so I used a cheap Chinese 4th axis that 1. Is low profile so it's easier to machine closer to the chuck, 2. seems to really lock the chuck tightly so there is no backlash or slop. 3 there are only 33.3333333 steps per degree. 4. it wa pretty cheap
ArtF wrote:
Dan:
Happens to all of us.
Im betting it looks better next run..
Art
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Today I made a few changes and it looks like the 17tooth gear came out perfect. It meshes with no discernible backlash and there is clearance in the root. What do you think Art?
I plan to upload a video later today because I thing there are some things in the G code that you may want to take a look at. It seems like the X+ travel is excessive and the A axis at some point is really slow it took m35 minutes to machine a 20 IPM feed rate.
But overall this program is OUTSTANDING. And I can't thank you enough Art for all the help and for this great program.
Dan Mauch
BTW I post a link to the video later . My back was sore so I didn't want to lift my 8" rotary table so I used a cheap Chinese 4th axis that 1. Is low profile so it's easier to machine closer to the chuck, 2. seems to really lock the chuck tightly so there is no backlash or slop. 3 there are only 33.3333333 steps per degree. 4. it was pretty cheap
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Ahh.. much better. Still looks a small,small,tiny bit wide in the space..but with small tools and small gears its not surprising, but they
easily look good enough to use.
Look forward to your forensics.. good timing as over the next 3 months Ill be doing one heck of a lot of work
on all the G-Code outputs. Great to see it work out though, it means I wont have to reinvent the wheel on some
of the new code I need to do.
Today I made a few changes and it looks like the 17tooth gear came out perfect. It meshes with no discernible backlash and there is clearance in the root. What do you think Art?
I plan to upload a video later today because I thing there are some things in the G code that you may want to take a look at. It seems like the X+ travel is excessive and the A axis at some point is really slow it took m35 minutes to machine a 20 IPM feed rate.
But overall this program is OUTSTANDING. And I can't thank you enough Art for all the help and for this great program.
Dan Mauch
BTW I post a link to the video later . My back was sore so I didn't want to lift my 8" rotary table so I used a cheap Chinese 4th axis that 1. Is low profile so it's easier to machine closer to the chuck, 2. seems to really lock the chuck tightly so there is no backlash or slop. 3 there are only 33.3333333 steps per degree. 4. it was pretty cheap
ArtF wrote:
Dan:
Happens to all of us.
Im betting it looks better next run..
Art
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