Gear reduction

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AZ_guy
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Gear reduction

Post by AZ_guy »

I have no idea how well this will work but I ordered some
Planetary gear reduction units to go on my Nema 23 motors on my plasma table. I know the backlash can be an issue so if it ends up not working then I’ll put together some belt systems to gear the motors.

The reduction is supposed to be 10:1. To program it in Mach 3 do I just multiply the steps per inch by 10? Or is there something else I need to do?

Also for the back lash, is there a way to calculate the backlash then compensate for it?
AZ_guy
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Re: Gear reduction

Post by AZ_guy »

These are what I’m trying

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Larry83301
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Re: Gear reduction

Post by Larry83301 »

To adjust for backlash in Mach 3 just go to the config tab and click on backlash, it will bring up a table with all the places you can adjust, just put in the amount of backlash you have on each axis and you're done. I would check it several times in different places on my table to verify it was right.


Larry
AZ_guy
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Re: Gear reduction

Post by AZ_guy »

Larry83301 wrote: Sat Oct 19, 2019 1:11 pm To adjust for backlash in Mach 3 just go to the config tab and click on backlash, it will bring up a table with all the places you can adjust, just put in the amount of backlash you have on each axis and you're done. I would check it several times in different places on my table to verify it was right.

I’ve seen that setting, glad it seems that straightforward. How do I measure the backlash, is there a test I can run?
Larry
robertspark
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Re: Gear reduction

Post by robertspark »

Use a Dial Indicator such as one of these:

https://www.google.com/search?q=dial+in ... kWerHPX00M:

What I do is write a Gcode programme which shunts my axis back and forth in small increments until the dial indicator starts to register the change.... that is when backlash is removed.

eg:

Code: Select all

#1 = 0.001
#2 = 0.001
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
M30


O2 
G0 X#1 
G0 X0
M99
AZ_guy
2 Star Member
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Posts: 84
Joined: Wed Jul 03, 2019 9:51 am

Re: Gear reduction

Post by AZ_guy »

robertspark wrote: Sat Oct 19, 2019 3:58 pm Use a Dial Indicator such as one of these:

https://www.google.com/search?q=dial+in ... kWerHPX00M:

What I do is write a Gcode programme which shunts my axis back and forth in small increments until the dial indicator starts to register the change.... that is when backlash is removed.

eg:

Code: Select all

#1 = 0.001
#2 = 0.001
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
#1= [#1+#2]
M98 P2 L10
G4 P2000 (pause 2 sec)
M30


O2 
G0 X#1 
G0 X0
M99
So you just take note of where in the Gcode it starts to register in a dial indicator? How can you tell what the amount is at the stopped point in the gcode?
AZ_guy
2 Star Member
2 Star Member
Posts: 84
Joined: Wed Jul 03, 2019 9:51 am

Re: Gear reduction

Post by AZ_guy »

Ok change of plan those planetary gears didn’t work at all. They felt a little sloppy just to my hands so I’m sure they had an insane amount of backlash. Also the shaft size was wrong so I sent them back.

Is there a company that sells the belt gear reduction as a kit? So the gear that goes on the motor, belt, end gear plug gear drive for the rack?
AZ_guy
2 Star Member
2 Star Member
Posts: 84
Joined: Wed Jul 03, 2019 9:51 am

Re: Gear reduction

Post by AZ_guy »

Going to try these and hope for the best

http://www.cncrouterparts.com/standard- ... -p-50.html
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