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Type: Posts; User: arizonavideo

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  1. Replies
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    Re: Re-ball ball nuts

    The amount of play you have is not the same as how much you need to increase the ball size. You are fitting the balls in a V but really its more like exponential curve. Some times a small change in...
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    Re: STAY AWAY FROM ARIZONA VIDEO

    Thanks ;)
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    Re: STAY AWAY FROM ARIZONA VIDEO

    I gave you the refund not paypal. I have only had 2 refunds in the past year. PayPal would never tell you that my account "might" get pulled. I have used them for 15 years and have few complaints...
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    Re: Clone Advice Needed (1st Post)

    I don't think the 940 is sold in a China clone. The 12Z or the old Industrial hobbies is. It is a 1000 pound mill but has the slow gear head. 10.5" of Y but you can get 12".

    No CNC kits are out...
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    CNC parts request

    Hi guys I know this is not the correct place to put this thread but I dont see another place here to do it.

    I make a good amount of aluminum parts that I sell and want to farm out some of the...
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    Re: Should I shim those bearings?

    Buy some AC bearing they are about $7 each. You might need more shims. Set them tight so you can not feel any play in the bearings and it will only spin 2 turns or so by hand if you remove the...
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    Re: Concrete VMC

    That might be the nicest machine work I have seen here.

    Great video.
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    Re: PM-30 Build Suggestions

    The PM-30 has Tapered Roller bearing stock. They are a strong bearing but will make a lot of heat at higher speed. Most all the bench top run them.

    Breaking takes a long time lets say 20 hours. If...
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    Re: Poll: Acceptable lost steps?

    On a 5 TPI ball screw and a 200 count stepper motor with direct drive I think that is .001" per step.

    I would say your not loosing steps.

    Not only that but if your loosing steps they will add...
  10. Re: Help pricing old non-working harbor freight mill

    Sell the belt drive for almost full list. It is a demand item and is light to ship. Ebay it.

    Put the mill back to stock and sell the rest for $ 100 to $200 non working. I know everyone is saying...
  11. Re: About to start PM-728 CNC conversion I need advice.

    Nema 23 for the X-Y is fine. With CP you don't really save any money with the 23. The small Nema 34 are OK too and they will stick out less.

    Nema 23
    ...
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    Re: PM30 Owners - Need Some Dimensions

    If you guys want I can just make a few mounts and screws up for the 728.

    I dont think much will fit from the 30 or 727. If they used RF-45 mounts then some of the PM-25 will fit.

    The Y is the...
  13. Re: I built my own ATC Tool Carousel, would anyone be interested in me open sourcing

    Looks like a nice changer. Lots of peole woud like plans and the macro. Are you running Mach3 or4?
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    Re: Advice on buying a milling machine

    A used RF-31 might be found for around 500 not a bad mill.
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    Re: Type 45 bearing question

    That is fine.

    If your ball screw nut has slop you will be able to move the screws around. If its tight it will have almost no movement. Having a bearing on that end wont change the backlash or...
  16. Re: G0704 Motor doesn't turn on NEED HELP

    You need to close the splash gard...:banana:
  17. Re: Nema 34 12.0 Nm(1699.68oz.in) or 8.25 Nm(1168.53 oz.in)????

    For the PM-25 a 640 oz 6A Nema 34 is already over kill.

    A 1600 is crazy.

    Total over kill size would be a 900 oz. The Z runs fine with a Nema 23 570 oz.
  18. Re: Double ball nut worth it for long C7 grade rolled ball screw?

    I did the sliced nut trick once too. Back whenI used the Roton ball screws with single nuts, it was quite hard to get no backlash with the screws being all over the place in diameter.

    I sliced a...
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    Re: PM-25MV conversion

    The table change was years ago.

    I still do the kits for the PM-25. Feel free to PM me or email me at [email protected].

    The new website is almost done.

    Thanks
    Dave
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    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...
  24. 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...
  26. 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.
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    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?
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