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Type: Posts; User: arizonavideo

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  1. Re: hybrid Closed Loop Stepper vs dmm servo

    I have both the DMM and closed loop and regular steppers. The closed loop are a nice product. Get the 2.2Nm for the X and Y and the 4Nm for the Z.

    The DMM are faster and quieter but the closed...
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    Re: speed vs torque graph for stepper?

    A simple way is just to look at the amps draw.

    If you have a 425oz and it runs 3A it is high inductance and will be weak at high speeds unless you hit it with 80V.

    If your Nema 23 is 5A then it...
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    Re: PM-30MV with BT30 Spindle?

    The PM-30 is just large enough for 56C size motor.

    A 2HP with a larger pulley can get you 6 or 8K with good power. The 30 is not that large so 6K with a 1/2 cutter is about right.

    You would...
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    Re: pdm 30 vs cx 601

    I had a round column.

    I really liked the motor and the high speed was nice and the longer 5" quill was nice. It still flexed a lot more than the PM-30 I have. Really the 30 size mills will do...
  5. Re: PM-25 Belt Drive Mod - 4700 RPM with stock motor

    Glad its working out.

    Did you do the spindle bearing?
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    Re: pdm 30 vs cx 601

    Do you mean the PM-30 mill ?

    I looked up the cx601 and it is a Weiss 30 mill. The older ones had a two speed gear box and a brushed DC motor and the listings says the Cx601 has two speds with a...
  7. Re: PM-25 Belt Drive Mod - 4700 RPM with stock motor

    Nice job. it does sound the motor is giving max power. I dont know how it will do like that.
  8. Re: 0.03mm backlash acceptable, yes/no?

    If the mill is new then .0012" is fairly good.

    Backlash comes from all the components not just the ball nuts. On of the leading caused in a new mill is stick slip and way friction. After the ways...
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    Re: Fixed Gantry Build

    A few things.

    The 20mm rails are fine but the carts might need over sized balls to be tight.

    I just re did a few 16mm rails and it really worked well. I think they run the same size balls so if...
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    Re: Concrete VMC

    I really liked the sound of the cuts.

    In the end you can tell how the mill is going to perform by the sound. Most hobby mills are light and have a higher ring to the sound. The buzz from yours has...
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    Re: Concrete VMC

    Looking rather nice.

    Is the head two pieces for tramming?
  12. Re: started my cnc conversion for Precision Matthews PM-25MV Mill

    Yes, working on them
  13. Re: Questions on bearings for Belt Drive Conversion

    For the lower bearing if your going to do the work just go to AC bearings.

    Any Japan bearing will be fine. Standard grade. I got .0003" run out from a 20 year old USA bearing and .0004" from a...
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    Re: ENCO RF45 Clone CNC Conversion - LinuxCNC

    I think I have seen that belt drive before.

    How about a good word?
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    Re: Horrible Surface Finish

    I'm thinking bent ball screw or the end work is not centered.

    I know it sounds strange but loosen the bolts on the bearing support side of a screw and see if it gets better.

    It could be...
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    Re: Concrete VMC

    Looks nice.

    I see you added a few bits of steel to some of the high pressure points.
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    Re: CNC router build

    Spa blowers are the same as vacuum pumps.

    Lots of them around
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    Re: Chester 20v and G0704 comparison

    For the RF-45 go ahead and run the 25mm. It will last longer.
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    Re: Concrete VMC

    I'm looking forward to seeing it set up too.

    It is really nice to see someone step up and do something that has not been done too many times before.

    I hope the results prove good.
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    Re: How much rigidity do I need

    You might give us a little bit more to look at.

    Steel is quite hard to cut for a light mill. Large bits will generate much larger forces so will flex the mill a lot. Smaller bit will cut better...
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    Re: G0704 12 tool ATC

    Really nice.

    Did you use mach3 to run the changer by a macro or did you build a separate board?
  22. Thread: THE GRIZZ

    by arizonavideo
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    43,305

    Re: THE GRIZZ

    Each motor has a a number of winding.

    Each winding is a inductor that stores electric charge. If things go right that power is discharged into the magnet field and turned into work. During a E...
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    Re: PM0-25MV BallScrew installation

    Have someone help you.

    Put one end of the ball screw in a drill and have someone run it fairly slow, use a strip of sand paper on the bearing shaft to give it a light sanding.

    Its fairly easy...
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    Re: would you buy this machine?

    I cant tell if your lathe has a hydraulic pump on it or not. If so it will have a lot of drag on it and the smaller 2.2K VFD might be a problem.

    I have been running my 3 phase lathe on a VFD for...
  25. Thread: THE GRIZZ

    by arizonavideo
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    43,305

    Re: THE GRIZZ

    This is always a problem with all motor or drives for any inductive load.

    If you want to run lets say a 80V system at around 10A then you have a few choices to make for outputs. You can run a...
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