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Messages - RICH

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5551
General Mach Discussion / Re: Problems threading on the lathe
« on: October 20, 2009, 09:57:08 PM »
ART,
Two more tests as follows all decreasing in pitch. Distances are from the start point.
        
RPM    SCRIBE       PITCH       1" DIST       2" DIST       3" DIST     3.4" DIST
-------  ---------         ----------    -------------     ------------    ------------      --------------
115    1 / SINGLE    .1           (-) .001       (-) .0032     (-) .0038"
402    2                 .2            (-).0018     (-) .0046     (-) .0078"    (-) .0089"

DATA REPORTS ATTACHED
RICH

MODIFIED: ADD PICTURES

5552
General Mach Discussion / Re: Problems threading on the lathe
« on: October 20, 2009, 06:28:52 PM »
ART,

Yep, looks that way.

402  RPM / .2P / 20 PASSES 0.002"   / DATA REPORT ATTACHED /   kernal speed increased to 45k
- SINGLE SCRIBED LINE / no screwy passes, CONSISTANT DECREASE IN PITCH ALONG THREAD
- @1.5" (-) .0043"

Just for you i will do a long one. The bathroom still has some plumbing left in it!
Will do two at 402 rpm, one at .1p and the other at .2p , since i can do them from the same starting point on one piece.

RICH

5553
LazyTurn / Re: LAZYTURN MANUAL
« on: October 20, 2009, 05:47:09 PM »
Not sure what you saying Dennis.
I would think that the CAM program , ie; Dolphin or what ever would have a postprocessor for MACH Mill and a seperate one for the lathe. In fact you may find there are two for the lathe,one for  diameter mode and another for  radius mode.I have used Fanuc to when trying some CAM programs and worked fine.

Now as far as Lazcam, it has it's owne postprocessor.

RICH

5554
General Mach Discussion / Re: Problems threading on the lathe
« on: October 20, 2009, 05:13:51 PM »
ART,
115 RPM / .2P / 20 PASSES 0.002"    DATA REPORT ATTACHED

- SINGLE SCRIBED LINE / no screwy passes, CONSISTANT DECREASE IN PITCH ALONG THREAD
- @1" (-) .0038"
- @1.5" (-) .0063"
- @1.8" (-) .0072"

Now were do you want to go? I can change kernal speeds and try .2 at 402 rpm.
RICH

5555
General Mach Discussion / Re: Problems threading on the lathe
« on: October 20, 2009, 04:17:47 PM »
ART,
Will try one out. You don't know what you have when you get multiple scribe lines.
RICH

5556
LazyCam (Beta) / Re: Drawing into LC and then to Mach
« on: October 20, 2009, 01:58:05 PM »
Post the JPEG image and also the DXF file of that image.

Don't know anything about Inkedge or have ever used it. Most raster to vector image conversion programs, suck, that's just my opinion. As DXF's go, have a look at the LazyTurn manual Appendix "C" as that will give you some insight into why a version 12 DXF. They are not all created equaly.!

If you want to a workable DXF see the Manual for LazyCam as i have posted them there and they are used for the tutorials.

RICH

5557
General Mach Discussion / Re: Problems threading on the lathe
« on: October 20, 2009, 11:35:31 AM »
ART,
Progressively decreasing. For TEST#2 at the 1"/ 10 pitches 1line (#18) @ -.0018" and the other line at - .0048".
At 1.5" / 15 pitches  #18 @ - .002" an the other @ -.007"
RICH

5558
General Mach Discussion / Re: Problem in a curve drawings
« on: October 20, 2009, 06:46:46 AM »
I am guessing that you have your motors set at the max velocity that they will go and they are both equal in steps per unit.
Lower your velocity to, say 70% of max, and see what happens.
RICH

5559
General Mach Discussion / Re: Problems threading on the lathe
« on: October 19, 2009, 11:57:03 PM »
ART,
This picture better shows what was actualy seen. The shift is more logical based on the report ( 8 & 9 ) pass.
I don't understand why #10 to 16 stayed on this side but they did. The report dosn't account for what actualy happened.Now 18 seems logical as it would be deeper and was on that side. Pass #17, 19 &20 are somewhere on the other side, not necessarily as shown ( that's my guess) since all i could see was that they shifted over to that side.

The only way i can take a better shot of the marks would be at 100X and would probably need to cut into the tube and look at a cross section or get my other microscope working.

BTW:  Chucked up about 10 lbs of weight to load down the spindle some and ran some dry runs. Yes , the rpm dropped from
402 to 401, but there was no change in the in the error report. Just figured that maybe adding mass to the rotating spindle  / inertia would make a difference.

RICH

5560
General Mach Discussion / Re: Problems threading on the lathe
« on: October 19, 2009, 11:39:16 PM »
ART,
Your only looking at 0.002" total depth. The lighting when taking the picture can skew the actual outline.
I am going to post another / revised picture  for test # 2 with some info to refine the information. I think it's important.
Should take  about 15 minutes.
RICH

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