Member postings for Lloyd Bowers

Ah, it just fits past the bed for fitting or trying to fit to the spindle. not sure if it fits in the chuck and still miss the bed.

Ive been given a face place, but the thread diameter is too small for my head stock, do you think i can thread it out to fit? would it sound right to think my spindle thread is 12 TPI, at a quick thread diameter of 1"1/16-1"1/8, where the face place is currently 15/16"-1" doutside thread diameter. if both are 12 TPI can i keep turning the inside thread of the faceplate at 12TPI till i bore out far enough? or am i talking out of my ...behind!!!

P.S. remember in still green!!!! thanks

i hope not. dont try to worry me with those possibilites.

does the fixed steady fix to the cross slide?

yep the bar worked, kind of? some how end to end was fine or ajustable to be fine. but the middle was slightly thicker? is that flex in the work piece due to the pressure of the tool acting on it?

ok i see. thanks. ill try it and see. do you also double check the tool is centred at both ends before or after?

ok, thanks, will do and recheck.

am i right in thinking high isnt as important as side/side?

yeah i did think of that, but i dont think it would be all that much, and there was a little near the chuck. im going to try a stiffer bigger bar to hold the gauge..

hi all, thanks for the surgestions i think ive basicly done what you've said nobby but dont own a sensitive dti,  im just got a plunger type, so exspected a thou or two difference, i used a magnetic holder for my dial, which was fixed to the chuck then the dial on the revolving centre that i have, checked it first at the back face, then the front face (side to side) then turned it to the top and saw it was out compaired with the sides.

I didnt do the outside of the quill incase the quill wasnt concentric. i done this close to the chuck first, then moved it back to about 10" where i need it for one bit im doing, i cant remember if both near and far were the same amound out?

Edited By Lloyd Bowers on 19/02/2013 11:05:36

Hi all, been looking and trying to set my tail stock to be dead centre on my exe 3.5 super, ive managed to get it within a thou to two side to side (towards/away from operator) but its still a little high, at least 0.5mm which i think is 20 thou i think. I have a dial gauge but over the 10" its a little "wobbly"? so ive ran the gauge side to side a number of times to check.

my question is is this high within tolerance? if not how can i adjust it, i think its level/parallel to the bed.

Edited By Lloyd Bowers on 15/02/2013 11:49:38

with your help ive compiled what i can cut with upto 2 compound gears. but there doesn't seem many useful pitches, a couple of metrics, so i defiantly need to look for more gears as you mentioned above andy!

Can someone tell me what they normally accept as within tolerance?

Edited By Lloyd Bowers on 15/02/2013 11:48:11

Just trying to ensure i got the calculations correct for if i know what TPI i want to cut. can someone confirm this? i guess its easier as i dont have many gears to chose from? we it makes sense to me! lol

TPI that will be cut = 8 x Driven1 x Driven2 / 24 x Driver2

simplified to TPI to cut = (driven1 x driven2) ÷ (3 x driver2)

So 20(TPI) = Driven ÷ driver (so driven ÷ driver = 20)

rearanged to be

If no compound 20 x driver (3) = driven (60)

Compound 52/32 20 x (3 x 32) = 1920 or 1920 ÷ 52 = 36.9

so I could use spindle (24) driving 52/37 (or 36) driving 47 to give a 20.04 TPI with a 37, or 19.5 with a 36

for a 1mm metric

Compound 52/32 25.4 x (3 x 32) = 2438.4 or 2438.4 ÷ 52 = 46.89

so I could use spindle (24) driving 52/32 driving 47 to give a 25.46 TPI

I know these may not be useful threads, but im more after getting the calculations correct.

heres a photo of the lathe when i bought it.

you can just see all the gears and the two clutches.

Edited By Lloyd Bowers on 13/02/2013 23:34:47

Can i just check, is the dog clutch the one that dis-engages the leadscrew form the gears? would i be right in thinking you can just dis-engages it when you get to the end of your run? but wont that cause a grove at the end of the thread as the spindle is still turning(till you switch off)? I guess a grove is better than hitting the end or chuck! I guess it also enable a good alignment for the next cut?

soory for asking dim questions.

ok, thnaks again andy, explained very well.

ok, tjanks for the info ray.