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Messages - Tef9

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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 :o)

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

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