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Author Topic: 1 axis jog=smooth 2 axis jog= rough?  (Read 5997 times)

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Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #10 on: June 05, 2011, 12:43:16 PM »
i dont do anything crazy accurate.
so it looks like i should start low on the encoder count and work my way up to the performance level i need?
my encoders are pin adjustable. they are the cui 102's

Offline Hood

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Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #11 on: June 05, 2011, 12:43:48 PM »
The way I am seeing it is if you keep the higher count encoder then its making things easier for the drive to keep things in position as it should be able to react quicker to motor movement, assuming the drives are capable, which I am sure they are. I personally dont like using electronic gearing as I normally have no gearing  but because this setup has a high gearing then I dont really think cogging would be an issue.
Of course everyone will have their own views ;)
Hood
Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #12 on: June 05, 2011, 12:45:17 PM »
what is electric gearing?
i am running 320x's
« Last Edit: June 05, 2011, 12:58:34 PM by turbothis »

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Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #13 on: June 05, 2011, 12:48:39 PM »
Personally I would use electronic gearing if your drives support it. As said I am not a fan of it but with the high gearing you have it would be fine I think.
Hood

Offline BR549

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Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #14 on: June 05, 2011, 01:05:58 PM »
Electronic gearing is where the DRIVE can take 1 pulse from the controll then output a mulitipled BLOCK of pulses (Say 10x) to the motor for each input pulse.

IF you can "simply" change the resolution of the encoder, try it you may like it. Don't forget to reset the motor tuning to match.

 IF not then try other approachs.

It is always about the final results rarely about how you get there, UNLESS you have restrictions in hardware. Then you are limited to approaches that use the GIZMOs you have to work with.

Just a thought, (;-) TP
« Last Edit: June 05, 2011, 01:08:18 PM by BR549 »
Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #15 on: June 05, 2011, 04:34:15 PM »
thanks guys, i will play with it some.

Offline Hood

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Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #16 on: June 05, 2011, 05:30:25 PM »
You may also need to retune your servos if you alter the encoder count.
Hood
Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #17 on: June 09, 2011, 01:26:42 AM »
so i got my encoders down to 200 count, 4-1 belt drive, and 5tpi screws.

i can net 130ipm pretty easy and she is very much smoother on the xy jogging together. i did notice the speed says it is doing like 170ipm which i thought funny because the motor tuning is @ 130ipm. how does that work?

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Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #18 on: June 09, 2011, 04:35:57 AM »
Is that when moving two axis that you see the higher rate?
Hood
Re: 1 axis jog=smooth 2 axis jog= rough?
« Reply #19 on: June 09, 2011, 11:22:28 AM »
yes
both xy are set to 130ipm and when you jog both at the same time it goes up to around 170ipm on the mach speed tach thingy. the table seems to be doing just 130 though. i can hear it running the same speed as it should.