Messages

1041

General Mach Discussion / Re: Problems threading on the lathe

« on: April 09, 2009, 08:18:53 AM »

Hi John:

  Here is a driver with a subtle change in the corrects.. Id be interested in the result of a thread
on this as you tried yesterday... Id like to see if the cyclic changes are still there..

Thx
Art

1042

Building or Buying a Wood routing table.. Beginnners guide.. / Re: Planning Strength, speed, stability..

« on: April 09, 2009, 08:09:38 AM »

Hi Guys:

  Sorry for the long absence form this topic, been awhile since I visited here due to workload.

In answer to the above questions, bearings can be placed in any of the top, side or bottom, no real
advantage structurally I think, but side or bottom is advantagoud bnecause it gets them away from
your material. We didnt do that, we went for Top mount simply because it was easier and worked for us..

 Here's some photos of the table as the rebuild comes down to a close..

Art

1043

General Mach Discussion / Re: Problems threading on the lathe

« on: April 08, 2009, 06:05:58 PM »

John:

 Perfect testing, Thank you. A picture is truly worth more than 1K words.

 Very strange results.. not what I expected at all. The cyclic nature is evident in the second photo. .

 SO the special driver, ( which simply has speed correction turned off ) seems to do much better, but since its not
correcting the volume is off due to variance..

 I have to think about this one before I come up with another test, we're definitely onto something though..

Thx
Art

1044

General Mach Discussion / Re: Problems threading on the lathe

« on: April 07, 2009, 10:11:00 PM »

By the way, nice looking lathe..

1045

General Mach Discussion / Re: Problems threading on the lathe

« on: April 07, 2009, 10:10:14 PM »

John:

 Thanks, that will be interesting. If the long alloys look the same, and the new driver also looks the same it will point in one direction, if the
new driver seems fine it willpoint in another..

(Nice pictures by the way.. Im impressed..)

  The RPM reading is good, Im pleased there.. Whats it do with averaging off? Does it vary allot more?

Thx
Art

1046

General Mach Discussion / Re: Problems threading on the lathe

« on: April 07, 2009, 06:57:56 PM »

I suspect proper prep was done, Stev and John are pretty good machinists. Im not sure why their threads dont look like some
of the ones here, but John does report his Aluminum threads are good, its the steel ones that seem to vary in pitch as it goes.
Ill run soem diags witha special driver with them to see if turnign off spindle speed correction shows anythign interesting..

Thx for your input..

art

1047

LazyTurn / Re: LazyTurn

« on: April 06, 2009, 11:48:58 AM »

Atually, the two descriptions shoudl be identical.. the circle shoudl be inside..

Ill check it out.

Art

1048

LazyTurn / Re: LazyTurn

« on: April 05, 2009, 12:21:06 AM »

Rich:
 
  That one where you draw "Actual Tool Radius" the circle shouldnt be any larger than the tool tip, the tool is drawn using actual tool radius..

Your right, the shape is the reuslt of the final pass..

Art

1049

LazyTurn / Re: LazyTurn

« on: April 04, 2009, 02:29:46 PM »

Its hard to explain in words real well. The left overcut can be explained in terms of the Remaining material calculator.. but I really need to come up with a way of showing you why a cut occurs instead of just the cut that occured. It may help explain why something is done. Im not saying its right, just that showing the why's may help explain and find solutions. The left hand overcut for example can easily be understood if one understands the process involved..

Art
 

1050

LazyTurn / Re: LazyTurn

« on: April 04, 2009, 11:05:03 AM »

Hi:


  I think, when displaying a toolpath, I need to show the PREVIOUS stock remaining, it will make it much clearer as to why the differences above.
The program will do the secondary passes as it can fit the selected tool into the remaining stock.. pics will make it clearer..and may show trouble better.

Thx
Art