Messages

521

General Mach Discussion / Re: Unequal Depth of Cut

« on: September 27, 2012, 08:09:18 AM »

Good idea Dave,

I have a Taig spindel and the table top is about 27"x 41". What will be the best endmill to do this job?

522

General Mach Discussion / Re: Unequal Depth of Cut

« on: September 26, 2012, 08:35:46 PM »

Sorry but my straight edge proved to be NOT so straight. Checking the table top with a new straight edge proved that the top is out the wack in numerous places.

So I removed the Aluminum top and installed a 5/8” thick MDF and now all is fine

523

General Mach Discussion / Re: Unequal Depth of Cut

« on: September 25, 2012, 06:42:55 PM »

Actually I started to do my 1st cut on a piece of MDF and noticed that the depth was not equal. Then I mount my indicator on the spindle and noticed the same.

I do have a straight edge and the table top is flat so the problem must be somewhere on the parts of the X axis. I doubt that there is screw deflection.

I will take measurements as you say RICH and hopefully I will find the error

524

General Mach Discussion / Unequal Depth of Cut

« on: September 25, 2012, 02:46:34 PM »

There is a difference of 0.070” on the depth of cut from one end of the X travel to the other and I can’t figure out where the problem is

On the attached pic, points A,B, C are equal to the table top on both ends and the D (Z axis plate) is square to the table.

What I should check next?

525

General Mach Discussion / Re: MDI Input

« on: September 25, 2012, 02:43:58 PM »

Thanks Hood, 5080 was the right number

526

General Mach Discussion / Re: Cutting Fluid for Aluminum

« on: September 25, 2012, 02:42:47 PM »

My Aluminum it is 6061 and so I will first try the oil and then the WD40

Thanks for the help

527

General Mach Discussion / Re: MDI Input

« on: September 24, 2012, 06:59:24 PM »

My ballscrews have 10mm Lead or Pitch and the G540 driver has 10 microstep drivers

When I follow Mach3 manual par 5.5.1.2 & 5.5.1.4 the above should give me 4000 which I put into the box “Steps per” in the motor tuning screen.

But 5.5.1.1 says for a 2mm pitch screw: (screw revs per unit) = 1 divide by 2 = 0.5 revs/mm and in my case with 10mm pitch I get 0.1. Where do I put this number? 

528

General Mach Discussion / MDI Input

« on: September 24, 2012, 02:06:21 PM »

I started the testing of my cnc and I want to use fist the MDI window for safety reasons

So I zero the DRO and I type G00 Y12.0 (for 12”) but the axis keeps going past the 12” by a lot

I type G00 Y1.0 (for 1 foot) and the axis stops at about 5”

My units are set for inches, so how I should type inches? Perhaps in decimals?

529

General Mach Discussion / Re: Cutting Fluid for Aluminum

« on: September 24, 2012, 02:04:42 PM »

Thank you Robert

I have searched many places on this subject and you are right, there is not a simple answer. I have a small pump controlled with a momentary switch and a manual valve at the outlet and was planing to squirt a few drops of vegetable oil once in a while. As I said I don’t plan to hog material out in one pass so I think a few drops of cooking oil will be fine.

I know about Tap Magic and other commercial liquids but I think they are too expensive for my needs. I thought someone on this forum may have come up with a simple solution for simple cuts

530

General Mach Discussion / Cutting Fluid for Aluminum

« on: September 23, 2012, 05:07:00 PM »

I will be cutting Aluminum for hobby use and probably I will never go more than 1/16” per pass with a feed rate of 10-15”/min. Should I use a cooling fluid for the end mill and if yes what kind?

I have seen others use from cooking oil to more expensive specialty cooling fluids for Aluminum and I wonder which one to use