Member postings for Andrew Douglas 1

Thanks all once again for your help.

So it looks like i need a 40 tooth and a 28 tooth as well as the 48 tooth.

The stated Module is 0.64 and i have searched high and low to find 28 & 40 tooth gears with such a Module.

I find that the nearest DP is 40 but again i cannot find any gears to suit

My next thiought was to cut a couple of gears and i can fend the neccessary involute cutters however most seem to be 14.5 degree PA as opposed to 20. I am guessing my 2mm pitch leadscrew being metric will need 20 degreePA or does it matter ?

Once again i value all your help and input

HI All

well firstly thank you for all your responses , i did not expect so many so quickly.

toi answer some questions

1/ the leadscrew is definately 2mm pitch (checked with thread gauge and eyepiece)

2/ The TDI gear is 48 teeth and the divisons on the dial ar 12 (odd numbered).

The changegears

H 30

......|

75 80

|

60 H

and gear box set to A (1.25)

The scratch thread is 1.25 so nothing wrong with the changegears.

The problem is picking up th thread with the TDI using the indicated positions 1, 6 , the thread is NOT picked up and i end up removing the crests of the already cut threads.

Any help appreaciated

Hi all,

Im hoping someone on here can help me out. I have had a Warco 250V for about 3 months and just getting on to screwcutting.

I have set up for 1.25 pitch with a 30 tooth at the top a 75 paired with 80 tooth in the middle and a 60 tooth on the input to gearbox, gearbox set to A , all as per the table & manual. The scratch pass creates a perfect 1.25 pitch so all good.

The problem comes when i disengage the half nut and use the TDi to pick up the thread again, the label on the machine says to used TDI positions 1,6 so I am using 1 and waiting for it to come back round again. The tool does not pick up the thread and misses by a small amount eaxch time thus taking the crest off the partially ciut previous thread.

Any ideas much appreciated.

I know i can just leave the nut engaged and reverse the lathe after backing off the tool so as to get back to the statrt but would really like ton use the TDI as idid on my previous machine.