Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: forrest on August 15, 2008, 05:07:04 PM
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I built a router with two direct drive stepper motors for the x axis. The machine is 10 feet long and 5 feet wide. I'm using Mach3 and a 4 axis driver from Mecntronis (easy cnc). I've set mach3 to use A axis as the slave axis of the x axis. The motors are using a timming belt systam and the dirive is direct so one revloution is 1.5 inches in the x direction. I've set it up and it cuts circles pokets and all that stuff pretty accurate but rough my y axis is an acme thread and runs about 4 reves per inch and seems smooth. The x axis is jumpy at low speed, you can hear it move it sounds like about a 30 40 herts pulse.
Is there any thing I can do to smooth this x axis out. on curves you can see each step the motor makes?
my thought is to make a couple of transmissions for the two motors so that each turns about 4 rev per in or so?
any thoughts would be appriciated.
Forrest
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Reduction gearing or a microstepping driver.
RC
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you got a link to your drives?
Hood
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I'm not sure what you mean by link, physically connected motors or electronically connected or?
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Sorry, I mean a link to the website of the makers. I have done a google and cant find any info on it.
Hood
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I built a router with two direct drive stepper motors for the x axis. The machine is 10 feet long and 5 feet wide. I'm using Mach3 and a 4 axis driver from Mecntronis (easy cnc). I've set mach3 to use A axis as the slave axis of the x axis. The motors are using a timming belt systam and the dirive is direct so one revloution is 1.5 inches in the x direction. I've set it up and it cuts circles pokets and all that stuff pretty accurate but rough my y axis is an acme thread and runs about 4 reves per inch and seems smooth. The x axis is jumpy at low speed, you can hear it move it sounds like about a 30 40 herts pulse.
How you did connect the motors (wires wise) parallel o serial?
Is there any thing I can do to smooth this x axis out. on curves you can see each step the motor makes?
my thought is to make a couple of transmissions for the two motors so that each turns about 4 rev per in or so?
any thoughts would be appriciated.
Forrest
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Hi, I think I have the same board, is they're pot on the board with test pins, you have to adjust each to about 5 volts(2 times the current of 2.5 amp) for the current and about 2.5 volts for the others.
http://cgi.ebay.com/4-AXIS-CNC-ROUTER-OR-MILL-STEPPER-MOTOR-DRIVER-BOARD_W0QQitemZ330262172457QQihZ014QQcategoryZ78197QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Is it this board?.
http://www.easy-cnc.com/web/download/Manual4Axis(NEW).pdf
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I'm not sure how to work with a Forum, I see I have 6 replies with questions I'll answer them all here??
Overloaded, It is a microstepping driver.
ostie01, yep thats her
uuccimi, parallel
hood, http://.easy-cnc.com
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it's microstepping
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it's easy-cnc
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parallel
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Sorry, I mean a link to the website of the makers. I have done a google and cant find any info on it.
Hood
it's easy-cnc
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Reduction gearing or a microstepping driver.
RC
it's microstepping driver
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Hi, I think I have the same board, is they're pot on the board with test pins, you have to adjust each to about 5 volts(2 times the current of 2.5 amp) for the current and about 2.5 volts for the others.
http://cgi.ebay.com/4-AXIS-CNC-ROUTER-OR-MILL-STEPPER-MOTOR-DRIVER-BOARD_W0QQitemZ330262172457QQihZ014QQcategoryZ78197QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Is it this board?. yes this is it
http://www.easy-cnc.com/web/download/Manual4Axis(NEW).pdf
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Have you adjusted the pot as oastie said?
Do your axis move the correct distance when you MDI a move?
Hood
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sep volts and amps are good, measurments are repetable to .oo1 over ten or more repetions
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Looks like gearing maybe the only way then, what are your steps per unit set at and is this imperial or metric you are using?
Hood
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units a imperial, steps per is a ripping 802.8114176 vel is 5 accel is 5 the driver is set to 1/8. Your conclusion is same as mine, if I make a 4:1 transmission it'l be very close to the acme im using on the y axis. Plus I can use the machine to make most of the parts now. Beats drilling sawing and lots of file work. Wow I just noticed your a Scott, wow isn't the internet a neat thing?
Oh, and thanks for all the ideas and thoughts
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Your motor will do 1 turn for every 1600 pulses so the carriage moves almost 2 inch for each rev of the motor? Can you get a smaller wheel on the motor?
Well almost, I am a Scot ;)
No probs, like to help when I can :)
Hood
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;D picturing Mario headbanging with a kilt on.
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I to am having the same jumpy problem at low speeds with my X axis using the 4 axis Mechatronics board.
I switched from a Xylotex 4 axis board that ran fine until a lack of proper grounding on my plasma cutter messed it up some how.
The Mechatronics board has a lot of good features so I’m hoping some how we can figure this out. I look forward to watching this forum post
Dzackman
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Solved my problem, it was a loose wire. For anyone else with the motor jitters at low speed, check and check again your wiring.
Dzackman