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Type: Posts; User: pastaman

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  1. Replies
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    Re: Horrible Surface Finish

    I isolated the column flex by putting a temporary spreader bar between the column and wall (see attached picture). This reduced the deflection to .002". I ran some profile passes and there was no...
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    Re: Horrible Surface Finish

    Thanks for the tip. I'm doing something similar. I got rid of the original adjusting screws and made a spacer that fits the gib screw counterbore with just a few thou of clearance then use a socket...
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    Re: Horrible Surface Finish

    I'm trying to isolate the source of the deflection as suggested. For my own satisfaction, using a .0015" feeler gauge, I checked for gaps between the column ways and the head slide ways. I also...
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    Re: Horrible Surface Finish

    I ended up putting a .008" shim behind the gib and tightened it as far as it would go and still no improvement in the head play. I'm chasing my tail! At this point I don't trust my readings. I...
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    Re: Horrible Surface Finish

    I ran the Z axis through it's travel range multiple times and was able to snug up the gib a bit more. I can no longer get a .0015" feeler gauge between the Z axis slide ways. Next step is to check...
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    Re: Horrible Surface Finish

    I understand what you are saying and do not disagree but this is an Asian mill. I don't expect it to be perfect. If I see an improvement with the arc and angular surface finish then I know I'm...
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    Re: Horrible Surface Finish

    I may have found something, only testing will prove me right or wrong. As I said above I checked vertical head movement by prying up on the head. I had about .010" deflection measured with a DTI. ...
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    Re: Horrible Surface Finish

    Here is a picture of the milling head. My plan is to check and adjust the Z axis gib then run more test cuts. I'll report back on how it goes.

    Edit: I did check spindle runout and deflection...
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    Re: Horrible Surface Finish

    I ran my DTI through the full table travel. I do have some droop (~.0015") at each end of the table but that doesn't surprise me. However, the needle does oscillate at each end of table travel. ...
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    Re: Horrible Surface Finish

    Here's the F360 gcode I ran yesterday. It uses G2. Is this what you were thinking?
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    Re: Horrible Surface Finish

    My mill is a PM-932 conversion. It's a medium size benchtop mill weighing about 850 lbs. Table is 9 x 32". Yes, steppers on X and Y are 1600 oz in and Z is 4200 oz in. Current microstepping is...
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    Re: Horrible Surface Finish

    I have not done a runout check on the ball screws nor tried conventional milling. Another test for tomorrow!
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    Re: Corner Probing Routine

    I've attached a picture of my XY axis locator. It also is a tool height setter. Pictures attached. Is this what you are looking for? If you are interested I can send you the script language.
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    Re: Horrible Surface Finish

    I ran several diagnostic tests this morning using CamBam and Fusion360 to generate gcode.

    For the first test I adjusted Arc Output to Convert to Lines and set Arc to Lines Tolerance to 0.001. ...
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    Re: Horrible Surface Finish

    Thanks Jim. I'll try your suggestions tomorrow.
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    Re: Horrible Surface Finish

    I'd like to say I never crashed my machine but that wouldn't be the truth. The mill is quiet and doesn't vibrate and straight line cuts are absolutely smooth. I'm thinking it's software related.
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    Re: Horrible Surface Finish

    I will do that in the morning when I get in the shop. Specifically what settings are you interested in seeing. I'd like to get you everything in one shot.

    Thanks
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    Re: Horrible Surface Finish

    Thanks for responding. I looked through the CamBam configuration settings and found Arc Fit Tolerance which is set to .001" and Auto Arc Fitting which is active. In the Mach3 post processor Arc...
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    Re: Horrible Surface Finish

    Jim - here is my CamBam file.
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    Horrible Surface Finish

    Good Day to All! Looking for some help from the resident wizards on how to improve surface finish on circles, arcs and angular cuts. First some background. My vertical mill is a PM-932 converted...
  21. Re: Adjusting Grid Size of grid for DXF Image?

    Try this. Go to Tools, then Options. Scroll down until you see Grid. If there is a "+" next to Grid click on it to open the available options. Clicking on Grid Info, either Inches or Metric will...
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    Re: 4th Axis Cambam wrapping tool

    Here is a link to the CamBam support forum and the Wrapper instructions, Wrapper Plugin.
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    Re: attempting first CAM on fusion 360

    I didn't get any error messages. Simulation looked good.
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