Member postings for Philip Sewell

Here are some images and sizes, as you can see I have a mill but no indexing head atm.

Thanks for all the replies. As suggested I rang HPC gears and the chap tells me it's 14 dp.

Then we went onto pressure angles which is again all new to me. Rather than more calculations I used a sliding bevel and eye balled the tooth angle on the rack. Then I penciled the line on a bit of mdf, flipped the bevel and remarked and this gave me about a 29 degree angle which I'm assuming is a pressure angle of 14.5. As I understand it will either be 20 or 14.5 so hopefully my method is ok for determining this.

So I have a shaft 100mm x 32.64mm dia with 62mm stepped down to 25mm. The gear is 14dp 15 teeth 14.5 pressure angle.

Do I have any chance of buying this off the shelf or is it a case of having a go at making it myself (which I'm quite keen to do but at the moment I haven't got a dividing head and they seem to be very expensive).

Any help much appreciated,

Philip.

I'd appreciate some help with a pinion gear problem. I am rebuilding my cva lathe and sorting out any wear issues. The pinion gear driving the saddle via the rack on the lathe bed is worn and I'm trying to work out what size it is to see if I can buy a replacement.

although the shaft size for the bearing is 25mm the diameter of the part where the gears are cut is 32.64mm so I'm presuming this was is imperial size, 1 9/32"

The number of teeth is 15.

How do I use this info to try and find a replacement gear?

(and any ideas where to look!).

Thanks

Philip.

Ok I will use gloss top coat on the lathe and a zinc primer. Thanks for your help.

On another matter the lead screws on the cross slide and compound are both quite worn and really need replacing. I have sourced the 5/8" 8 tpi cross slide screw from Kingston Engineering but the compound is 1/2" 8 tpi which isn't a stock size. is this an unusual size? Any ideas where I might source this?

Philip.

Thanks for your reply Chris. Yes you are right a gloss is going to highlight my prep mistakes. I have wire wheeled back to bare metal and spent a lot of time filling, sanding back and refilling until I've got it something I'm fairly happy with. I'm intending on using zinc primer to highlight any smaller imperfections.

Certainly with wood gloss is a more durable finish, is this the same with enamel paint?

Does anyone know if a gloss finish was commonly used on new machines?

Thanks

Philip.

Hello All,

New to this forum and would appreciate some advice.

Briefly I'm actually a cabinet maker by trade but I get a lot of enjoyment working on my mill and lathe.

I've owned a CVA lathe for probably about 10 years now (I think it's a superb lathe) and I have finally got round to stripping it down to repaint and sort out one or two wear issues (although it's always worked ok it looked dreadful).

I'll have more questions as I rebuild but I've been finding out about suitable paint today. I have decided to use Paragon enamel paint.

This is probably a preference thing but do people use gloss or one of the less shiny options?

I'd appreciate any advice.

Thanks,

Philip.