Messages

51

General Mach Discussion / Re: Muti-start threading....

« on: April 14, 2009, 11:46:47 AM »

Hi All,

I tried to multi start thread after upgrading to the latest version, no joy yet...when displacing the start by x do you have to do the z end by the same?

i.e if I want a 1.5 pitch thread and 3 starts I displace the start point by .5 so it goes

z0 0

thread code

z0.5

thread code

z1.0

thread code

end

However in thre thread code do I need to put the thread en point .5 mm earlier?

A

52

General Mach Discussion / Re: Muti-start threading....

« on: April 02, 2009, 07:33:03 AM »

That would be great.

Thanks,

Andy

53

General Mach Discussion / Re: Muti-start threading....

« on: April 01, 2009, 10:27:36 AM »

Bowber did you buy this tool or make it your self, ... got a pic your willing to share )

I was going to try making one.

Andy

54

General Mach Discussion / Re: Muti-start threading....

« on: April 01, 2009, 05:42:15 AM »

Lol , I asked an engineering company to quote me for a tap and die custom 4 start set....£600 eeek!

 A while ago I cam acros an article about threading on the mill with a single toothed cutter, is somthing you have tried?  I am keen to give it ago, my mill should arrive next week!

Andy

55

General Mach Discussion / Re: Muti-start threading....

« on: April 01, 2009, 05:04:04 AM »

Surly you just change the G00 Z start value.  I have not tried yet but I thought it should only be somthing like:

(1/4 z move each time based on a 1mm pitch)

G00 Z0.0000 (start 1)

G76 <thread code here>

G00 Z0.2500 (Start 2)

G76 <thread code here>

G00 Z0.5000 (Start 3)

G76 <thread code here>

G00 Z0.7500 (Start 4)

Or at lease that is what I thought, it should not affect the Z end or am I missing somthing?

Andy

56

General Mach Discussion / Re: Muti-start threading....

« on: April 01, 2009, 03:38:01 AM »

Will give it a go over the weekend and post a pic, Thanks for all the replyes so far!

Andy

Rich - I dont have an internal threading tool yet, if it arrives in time I will give a nut go as well!

57

General Mach Discussion / Re: Muti-start threading....

« on: March 31, 2009, 06:36:58 PM »

Ahhh I have set up an optical unit like Hood and rich with 1 slot in the disk, will that work?

Thanks,

Andy

58

General Mach Discussion / Re: Muti-start threading....

« on: March 31, 2009, 05:53:41 PM »

That sounds simple enough, however urm....what is index-pulse? is this the way the motor works?

Thanks,

Andy

59

General Mach Discussion / Muti-start threading....

« on: March 31, 2009, 05:18:56 PM »

Hello All,

I have played around with normal threading and I am starting to get some confidence, I am now looking at multi start threading via cnc and mach 3.

I last spoke to Hood about this here :

http://www.machsupport.com/forum/index.php/topic,10385.0.html

My questions are as follows:

1) Do I need to have controll of the direction of the spindle?

2) Do I need a special gear train for multi start?

3) Does mach 3 multi start thread by coming in at a different angle?  Will I need to vary the speed?

I am using a cnc Sherline.

The thread I would like to cut is a four way o.75pitch 9.5mm dia - straight, not on a taper...yet.

Thanks,

Andy

60

General Mach Discussion / Re: My First Mill and first CNC upgrade

« on: February 11, 2009, 04:17:22 PM »

Wow...thanks for all the responses...I was hoping there was little difference as the cost of servos is so much higher than the cost of stepper motors.  I would love to go for Gecko but sadly buying form the USA is expensive atm...sadly as you seem to have all the fun stuff 

Here is the the mill I intend to buy:

http://cgi.ebay.co.uk/AMA30LV-Milling-Machine-Variable-Speed-Long-Table_W0QQitemZ360127992736QQihZ023QQcategoryZ12584QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m153.l1262


and here is the stepper kit I was going to go for:

http://www.motioncontrolproducts.co.uk/product_info.php?cPath=5&products_id=8

I was going to replace all of the motors with this one as it has a higher torque...is that wise?

http://www.motioncontrolproducts.co.uk/product_info.php?cPath=4&products_id=11

I really am a novice at this but it seems to all things required in the kit, including a break out board for connecting upto Mach3

Any good?

Thanks,

Andy