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Author Topic: Y-Axis  (Read 2956 times)

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Re: Y-Axis
« Reply #10 on: January 08, 2016, 04:08:45 PM »
my breakout board is cnc4PC C1G and using smooth steep uc3000

forgive me, for not clarifying myself  the moving to the first position it drills at 1.7" but thereafter it drills at 2" center. However all holes are off by .281" from the 0,0
Re: Y-Axis
« Reply #11 on: January 08, 2016, 04:16:10 PM »
Actually in the last example the hole spacing is in Y and it starts at Y0 then spaces 2 " each step from there.  
(;-) TP

starts at x0,y0   then goes to x.97,y2  and so on by 2

Offline BR549

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Re: Y-Axis
« Reply #12 on: January 08, 2016, 04:16:25 PM »
That would indicate that you are loosing steps on the first move from 0,0 and coming up short. It stops at 1.7" instead of 2". Now the important Question does teh DRO should the correct values of teh first move from Y0  to Y2 ?

(;-) TP

Offline BR549

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Re: Y-Axis
« Reply #13 on: January 08, 2016, 04:18:41 PM »
You are correct I was concentrating on the Y and ignored the X (;-)

(;-) TP
Re: Y-Axis
« Reply #14 on: January 08, 2016, 04:21:51 PM »
That would indicate that you are loosing steps on the first move from 0,0 and coming up short. It stops at 1.7" instead of 2". Now the important Question does teh DRO should the correct values of teh first move from Y0  to Y2 ?

(;-) TP

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Re: Y-Axis
« Reply #15 on: January 08, 2016, 04:23:08 PM »
it shows as follows
1.9997
4
5.9997
8
9.9997
12
Re: Y-Axis
« Reply #16 on: January 08, 2016, 04:26:20 PM »
why would i lose step on the first move and not on the rest?

Offline BR549

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Re: Y-Axis
« Reply #17 on: January 08, 2016, 04:55:42 PM »
Try it by moving up on teh table in Y about about 2-3" from where you started originally.  It could be a stiction problem on tha table at that point OR it could be a controller problem OR you are right on the verge of loosing steps on teh Y axis config setup (Vel,acel) Try reducing teh Vel and Accel settings by 50% and rerun the Gcode.

Have you tried it with different Drill cycles ? G81 , G83, G73 ?   I would all 3 to see IF it made a difference.  Also I would try a manually programed cycle to help rule out some things.



Re: Y-Axis
« Reply #18 on: January 08, 2016, 05:13:22 PM »
i think i have may have found the problem, by reducing the velocity i noticed that tere is some play in the rack and pinion gear.  i will review and get give you an update.
thanks for all the help
Re: Y-Axis
« Reply #19 on: January 08, 2016, 06:16:24 PM »
yup that was it.  the lock nuts were loose on the pinion gear which caused backlash whenever the axis change direction. that is why it was losing step only on the first position

thanks for all your help you guys are GR8T