Messages

41

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

« on: May 07, 2009, 04:25:22 AM »

Daniel,

Thanks for that I did not think that the depth would be an issue.  I will try that tonight.

I have replaced the belt, the old one looked ok but having used it excesivly I thought a belt change would be good.

I will try later with a lesser depth.

Thanks

Andy

42

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

« on: May 06, 2009, 06:59:07 PM »

Ok, This is drving me nuts...but  I will not be beaten.

Here is the code I use to thread.  I do everything in metric, so I opted for a 0.7mm pitch with a 2.1mm lead (three starts).

Is this code correct?

does it work for anyone else?

Help

Thanks

Andy

G0 G40 G18 G21 G80 G50 G90
G00 G53 X0 Z0
T101M6
G00  X0.025
G00 Z0
G00 X0
M03 S120
M08
G76 X-0.5 Z-5 Q1 P2.1 J0.006 L0 H0.25 I29 C0.025 B0.0001 T0
G00 Z0.7
G00 X0
G76 X-0.5 Z-5 Q1 P2.1 J0.006 L0 H0.25 I29 C0.025 B0.0001 T0
G00 Z1.4
G00 X0
G76 X-0.5 Z-5 Q1 P2.1 J0.006 L0 H0.25 I29 C0.025 B0.0001 T0
M9
M5
M30

43

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

« on: April 21, 2009, 04:07:43 AM »

Graham - thanks - I already have somthing similar for external, however the internal threading I want to do would require a smaller diameter as some of my pens are designed around a 10mm dia cap.  Do you know of a tool that can get into smaller spaces?

Daniel - Good point and no I did notice fluctuations in speed in mach three only by one or two rpm...but when going at 120rpm that is a problem, will sort that out over the next few weeks....sadly off to london to partake in real ale drinking this weekend )

However my index system is a fast and loose one and needs attention.

Andy

44

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

« on: April 21, 2009, 03:45:52 AM »

I had a go last night with no success as my cutter grabbed the barss rod and that 'screwed' :oD the timing.

I will try angain tonight with much more shallow cuts.

Andy
p.s I have see people using what appears to be a spike for threading (which I assume is at 60 degrees)
Is this somthing you can buy or do you have to grind your own?

45

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

« on: April 20, 2009, 05:27:29 AM »

Thanks,

I will give it a go tonight, should have some brass rod ariving.

A

46

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

« on: April 20, 2009, 04:51:34 AM »

Hang on I think  I see you point, So if I set the pitch at 2.8mm and cut a four start thread is that an overall pitch of .7? (after increasing the z each time of course)

Andy

P.s did not think about the belt, will investigate a new one!

47

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

« on: April 19, 2009, 01:40:12 PM »

Ok...trying to be a bit more scientific about this, I have done one single start and one double start.

The single start has perfect unform looking threads, the double start seems...messy!

This method was done using the 'move the z axis' method.

any ideas as to why the second start looks messyer that the first?

I have tried the angle approach however have no pics ... yet ... will upload results soon.

Andy

48

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

« on: April 18, 2009, 11:59:55 AM »

I have just spent 4 hours having a go at this in various ways, will post some pics and more info tommorrow night when I get back.

Andy

49

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

« on: April 15, 2009, 07:53:24 AM »

Good Plan,

I might try and give it a go tonight, wont be able to make a nut to test it however if it looks uniform I will count it as an improvment.

Andy

50

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

« on: April 15, 2009, 03:54:57 AM »

Rich - I make pens so therefore I need a smooth multi start.

Hood - no not yet, will give that a go next.  The little lady has just gone back to uni so I now have some time now (i did not say that) 

Roll on the weekend !

Andy