Member postings for william austin

Hi Pete,

Many thanks for your kind offer. I am near Witney, to the west of Oxford, so a bit far just now.

I think that I may just cut the teeth on a disc to see how well it meshes using the cutters that I have. If it works, then progress to the spline. After all, the gear is not going to do much work, it just needs to stay in mesh.

I think that the spline may be more difficult to fashion.

If my crude gear attempt fails, then I may take you up on your offer and send you a disc or two.

As far as chasing the 85 DP target goes, I think that I am in the original boat by lacking the multiples of 9

William

Looking at the placard picture, my guess is for worms

Hi John,

It is an Imperial lathe but does have "dp" setting list and at one end of the spectrum are 40, 44 and 48 and the other 7,8 and 9. I have no idea what they mean

William

I think I will try to go down the path of a new changewheel.

I only have two DP16 14.5 PA cutters. A No 1 135 to rack and No 7 14-16. I know neither is perfect.

From the point of view with the workholding, a 54 or 63 tooth gear would do best for me. The No1 cutter looks much more suited to the 54/63 than the No 7 but that is a guestimate. The wheel would mesh with 100/120/127 depending on space.

Since the gear will be in Aluminium, it will hopefully bed in fairly quickly. I just really need to avoid it jamming but with enough mesh enable three adaptors in brass.

Does anyone have any thoughts?

Sorry about that, while I was composing the 09:33 post, I didn't spot DC31k's 09:07 pop up. My apologies

A big thankyou to everyone for the amazingly quick input. I am trying to make an adaptor for a new Propane torch nozzle. The old one is an Australian product that I think is a copy of an Anerican one. That is 3/8" x 27, the modern variety is 7/16" x 27. I agree that it is probably a case of manufacturer entrapment.

I can follow the comment from DC31k and I guess 7/3 is a constant either from the gear head or inherent in the gearbox.

I have 100/120 and 127 that could be compounded in the idler gear position to extend the combinations but I don't understand how to include that other than an iterative process. I have two options for a new gear, 1/2" Aluminium plate (which I have) to make a complete one or cast some HDPE (alias melted milk bottles) onto a smaller gear. For both I would need a gear cutter and for the former, to cut the 8 tooth spline.

Can anyone suggest the tooth form for the gear? I could do the spline on the lathe by indexing the chuck.

Hi Everyone,

I need to make some adaptors UNS 3/8" 27 TPI. This is not a standard pitch on offer according to the machine placard. I have a fair set of 13 change-wheels (21,35,36,39,42,49,57,60,66,69,100,120,127) and the original Bantam manual. Unfortunately, the manual is very short on explanation in the worked examples and it doesn't cover the possibilty of compounding (which is used in some placard solutions) of the idler stage or how to choose the gearbox settings.

Can anyone steer me to a methodology?