Gear reduction

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AZ_guy
Posts: 48
Joined: Wed Jul 03, 2019 9:51 am

Gear reduction

Post by AZ_guy » Sat Oct 19, 2019 12:51 pm

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
Posts: 48
Joined: Wed Jul 03, 2019 9:51 am

Re: Gear reduction

Post by AZ_guy » Sat Oct 19, 2019 12:56 pm

These are what I’m trying

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Larry83301
Elite Contributing Member
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Posts: 2134
Joined: Tue Oct 27, 2009 6:36 pm
Location: Twin Falls, Idaho

Re: Gear reduction

Post by Larry83301 » 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.


Larry

AZ_guy
Posts: 48
Joined: Wed Jul 03, 2019 9:51 am

Re: Gear reduction

Post by AZ_guy » Sat Oct 19, 2019 2:38 pm

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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Posts: 462
Joined: Mon Jun 12, 2017 6:43 pm
Location: nr Liverpool, UK

Re: Gear reduction

Post by robertspark » 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
UCCNC,
Sheetcam
Hypertherm Powermax 45 (nonXP)
Neuron Lite THC
Hobby user (4x4 home table)

AZ_guy
Posts: 48
Joined: Wed Jul 03, 2019 9:51 am

Re: Gear reduction

Post by AZ_guy » Sun Oct 20, 2019 11:50 pm

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
Posts: 48
Joined: Wed Jul 03, 2019 9:51 am

Re: Gear reduction

Post by AZ_guy » Tue Oct 22, 2019 6:59 pm

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
Posts: 48
Joined: Wed Jul 03, 2019 9:51 am

Re: Gear reduction

Post by AZ_guy » Tue Oct 22, 2019 7:40 pm

Going to try these and hope for the best

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

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