Thread: 7' X 4' Combi
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18-03-2013 #81
200mm/s^2 for the acelleration is very low. You should be able to get around 1 to 2 m/s^2.
The motion will be a lot 'smoother' if you use microstepping. I reckon you'll get around 8m/min, so that's 133mm/s. 200 step/rev is 20 step/mm, so 25000/(133*20)=9.4. So you can have anything up to 9.4 times the number of step/rev ... so try 1/8th microstepping.
The overall mass of the gantry doesn't make much difference to the feedrate you can get, it mainly affects the acceleration obtainable (Newton's 2nd law). Increase the acceleration and it will 'notice' plus the people will probably fall off which is an added bonus.
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18-03-2013 #82
I set the accelleration slow while i was setting things up as i was affraid of missing steps in one of the twin steppers and it all getting out of shape but as you suggest i will speed that up, Ok so how do i set it up to use microstepping then, (I thought i was LOL)
LOL that would be funny, if not for the fact i was one of them...
Was it good to see your ballnuts working then? and where are these extra points you said i could have.
RickLast edited by Ricardoco; 18-03-2013 at 10:46 PM.
Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
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19-03-2013 #83
Ok i think i have got itLOL
To get 1/8 microstepping.
I have 200 full steps per full revolution of motor as it is a 1.8deg motor.
360degrees (1 full revolution of motor)/200steps=1.8degrees per step
8 Microsteps per full step (1/8 microstep)
200x8=1600 steps per rev (1600 set on the driver)
10mm travel on gantry for 1 revolution of the stepper,
1600 steps/10mm=160 Microsteps per mm set in "steps per" in motor tuning
1mm/160microsteps=.00625mm gantry travel per microstep given 1:1 gear ratio motor to screw.
YES??
RickAlways bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
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19-03-2013 #84
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19-03-2013 #85
Well this just goes to show how fast things can arrive. The rails arrived this morning thats 4 days including the weekend, and this is the second time this has happened with this seller and all the way from Korea. Well hats off to them thats all i can say, they are listed as used on the add and to be fair they are immaculate. Magic
less than £200 and free postage as well.
GL20TF+1300mm Used Linear Bearing NB-Nippon Bearing SR20W THK NSK LM Guide CNC | eBay
RickAlways bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
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19-03-2013 #86
Nice one Rick but Jonathan better watch out, somebody has been stealing his designs
Rotary Nut BLR1616+BLK1616+930mm Used THK Rolled Ball Screw Support BK12+BF12 | eBayIf the nagging gets really bad......Get a bigger shed:naughty:
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19-03-2013 #87Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln
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19-03-2013 #88
Only if he supplies the ballscrew and nut at the same time?
If the nagging gets really bad......Get a bigger shed:naughty:
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19-03-2013 #89
Them ebay jobbies look abit shit IMO
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19-03-2013 #90
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