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Messages - LesC

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General Mach Discussion / What Ratio Do I use
« on: March 15, 2013, 10:19:19 AM »
Hi,

just wondering if I employ a couple of stepper motors for my X,Y,Z axis how do I go about sizing them , any tips welcome.

What is the normal reduction ratio you guys use on the tooth belt stage, I am guessing about 5:1. Ultimately this should give me my resolution right ?


regards   Les C

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General Mach Discussion / Re: Can Mach 3 do this ????
« on: March 14, 2013, 09:57:25 AM »
Thank you, Chaoticone and Stirling for your responses they are well received.  I have been using a Seig 3 miller of recent times with Mach 3 software and found a number of short comings of the machine (not the software) , which I won't waste your time on here.

I have now purchased an Alcock and Shipley miller ( Bridgeport purchased them I beleive )  and want to convert the machine from purely manual operation to a CNC Mill.

Do you know of anyone supplying a decent kit,  or any knowhow which may help me in my task. Instictively I would go for the servo and close loop to the drivers with error's being reported to Mach 3 option, but what would you go for ??

I have a resonably open mind on this but am concerned about worn leadscrews, backlash etc introducing error's into wok pieces that a half decent machinest would take out / not allow. Hence my stance on knowing where the table is and not on how many pulses went to a stepper motor.  I also don't want to incur a lot of expense on refitting the machine with new leads screws etc, but will do if it becomes paramount to a successful system.

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General Mach Discussion / Can Mach 3 do this ????
« on: March 14, 2013, 08:19:23 AM »
The problem with stepper drives, is that you may well put out the pulse to the motor from a controller card, it may have even turned, but due to toothed belts, worn lead screws, inertia, and anythink else you can think ,of the table may well not have achieved the requested position.

Therefore a better system is to take feed back via linear encoders that tell ' Mach3' where the table is and then Mach 3 can then decide how many extra pulses it should supply to get to the required position i.e. closed loop control. 

Can Mach3 do this ?????????

Can Mach 3  drive servo motors rather than steppers ??

I am the new guy on the block so appologies if this has been discussed already and I missed it.

Les C

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