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561  Mach Discussion / General Mach Discussion / Re: polished aluminum on: December 26, 2010, 03:19:45 PM
Assuming your machine is up to the task, as mentioned above, 3-flute carbide end mills designed for aluminium work best. They have very sharp cutting edge and milling on the side I can get very smooth surface seeing my own reflection. Using a good cutting oil helps a lot with aluminium to get a good finish.

Dan
562  Mach Discussion / General Mach Discussion / Re: Making a tapered thread. Please help on: December 26, 2010, 03:10:10 PM
The taper angle in your case will be:

tan-1(((0.750-0.310))/2)/1.850)

BTW, cut a taper thread only once, couple years ago, and it worked fine with the simple treading wizard.

Dan

EDIT: Ha.. ha. You're quick Rich. You posted the answer while I was typing Wink
563  Mach Discussion / VB and the development of wizards / Re: macros, Is this the way to do it? on: December 25, 2010, 01:18:12 AM
You can use a subroutine right in the G code, like this:

test.nc
G01 X2 Y0
M98 P101
G01 X9
M98 P101
G01 X14
M98 P101
G01 X15 Y5
M98 P101
G01 X0  Y4
M98 P101
G01 X1
M98 P101
M30

O101
G1 A2.5
G1 A0
G1 A1.7
M99

Read the manual for more details.

Dan
564  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: December 24, 2010, 09:40:48 AM
Never said it was not going to work Wink It's just not the common way to do this - press fitting a bearing in a sectioned housing...

Yes, we'll know soon how it works out. I guess no one has done this before, so your experience may help others. If anything, the biggest problem is going to be when using a 3mm part-off tool in alloy steel 30mm in diameter.

Dan
565  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: December 23, 2010, 03:18:12 PM
Hi,

1. my slide comes all the way out over the motor so unless i mount the motor backwards ill never have the room.

I know. I think it is worth considering.

2. the original mount is way to small for the new bearings.

Was suggesting to use the concept. Not the same mount.

I disagree as long as you have good bulk on ether side of the bearing your just not going to apply enough pressure to the bearing collar to get it to deflect, the inside has 200mm of cast iron slide and the outside had 30mm of Ali, im exposing probably less that 1/3 of the bearing which is hardened steel, the motors will give out or the belts will break before there is any significant deflection.

comments anyone with more experience?

cheers

It all comes down to the final rigidity of the machine. Motors and belts don't give you rigidity. Frame construction, mounts, bearings, slides and screws do. Your setup may and probably will work fine, but will be far less rigid than a proper steel mounting blocks. Depends on what you intend to be using the lathe for I guess.

Dan

 
566  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: December 23, 2010, 02:39:47 PM
Why didn't you use the original X screw mount extension concept? Not the most rigid setup to have the bearings exposed like this and in an aluminium block. It does look creative though Smiley

Dan

567  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: December 23, 2010, 01:06:02 AM
Had this happen several times over the last few days. I am sure it is being worked on though.

Dan
568  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: December 22, 2010, 04:29:01 AM
Looking good! What a pleasant surprise that the new bearings block and the original one align on same plane.

What accuracy grade are the ball screws?

Dan
569  Mach Discussion / Works in progress / Re: 3 PAGE LATHE SCREEN - WIZARD ADDITIONS on: December 22, 2010, 01:15:14 AM
The issue with zstart being swapped was never an issue. I think he was just looking at it wrong or something?

Correct. Was my mistake.

Haven't had a chance to mess with the OD Arc3 some more, but, as reported from the few tests I did, there was an issue in diameter mode.

Dan
570  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: December 16, 2010, 02:04:23 PM
The sheet metal shop we work with would cut it and CNC fold it to the drawing and the prices are so low (most of the price is the laser cutting) it makes it not worth messing with folding it manually, even if it's a simple bend. Ask your laser shop if they can bend it. Only adds up something like 2 bucks for a bend.

Dan
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