Messages

51

General Mach Discussion / VERY SIMPLE STUPID QUESTION.

« on: December 17, 2007, 07:37:22 PM »

Is there a difference between a parallel cable and a serial cable. I always thought the serial crossed over 2 and 3 pins and parallel kept them in line?

Also, should I use a parallel cable from Lpt1 to Breakout board?

52

General Mach Discussion / Lets pick a Spindle motor!

« on: December 04, 2007, 08:01:57 PM »

OK guys here is the deal:

I am building a machine to dress shapes into a grinding wheel.  I need to push a 14" dia grinding wheel to about 1000 rpm's.  The wheel should not be under much load because the diamonds I am using are .020" radius tips and I am taking .002" per pass at 3 IPM.  Looking for some suggestions for the most logical hook-up using  a C11 BOB.  What size and type of motor

Help is much appreciated!

53

General Mach Discussion / Re: newbie getting started

« on: December 04, 2007, 07:44:47 PM »

Thanks hood!

Not to beat a dead horse but if I have good ball screws and no backlash your saying I can count on accurate positioning within about .0001"?  sounds too good!

54

General Mach Discussion / Re: newbie getting started

« on: December 04, 2007, 07:24:36 PM »

Ok, so i am a little lost on how you got the 500 x 4 part .  I was thinking .2" devided by 500 CPR (lead dist / CPR )  What I am doing wrong Hood?

55

General Mach Discussion / Re: newbie getting started

« on: December 04, 2007, 06:40:06 PM »

well, here is what I ordered:

 
Qty Description Unit Price Amount
1 Mach3 cnc controller   
2 G320 Geckdriver
2 KL34-170-90 DC Servo Motor
2 US Digital: E5S-500-250-EG-PKG2
1 KL-7220, 72V, 20A
1 C11 - Multifunction breakout board

2 questions:

1 the encoders have 500 CPR.  What can I expect for accuracy with a .200" lead ball screw?

2 What should I use for a spindle motor to push a 14" dia grinding wheel?

Any suggestions?

56

General Mach Discussion / Re: newbie getting started

« on: December 03, 2007, 02:34:35 PM »

are there any drives, controls or servo motors that are not compatable or more compatable with mach 3?  Are gecko drives good? I am looking to hold some accurate profiles (.0002" over 1") for a grinding machine. I can't seem to find good newbie info.

57

General Mach Discussion / newbie getting started

« on: December 03, 2007, 10:53:48 AM »

Trying to find a good setup to build a 3axis machine.

what is the gecko g100? 

Is there a good cnc all in one package ready for purchase because I don't know much about the controlers and other hardware.  Is there a good basic 3 axis package that works good with mach 3? 

Any help is greatly appreciated!