Has anybody got.........

[woodbloke]

I have some hex bar if you want to make a screw, I also have some boxwood and a tap/die set if you want to go with wood...

Slightly o/t...your website makes interesting brekky time reading :shock: - Rob

 

[dannykaye]

thanks, I am still trying to find a student to improve it, if you want any of the math I can send you .ps files

which bits are interesting?

 

[woodbloke]

thanks, I am still trying to find a student to improve it, if you want any of the math I can send you .ps files

which bits are interesting?

Pass :lol: - Rob

 

[dannykaye]

there should be some pretty pics of hawks up soon, all I have to do is make a new page...

 

[Mr Ed]

Sean G asked me via PM for my method of making a thumbscrew such as those being discussed. I thought I'd put the explanation in this thread as it may be of interest to others.

WARNING - I am not a metalwork expert, this is just the method I have found works for me having made a few of these;

1. I hold a piece of brass round bar in the chuck and turn down to the required thickness for the stem of the bolt.
2. I turn a taper on the end - in the case of a lever cap screw I give it a bit of a round over with emery cloth or a file.
3. I turn a tapered groove where the stem meets the head - this is important as otherwise you get a weird off centre appearance where the thread stops.
4. I cut the thread using a die in a holder, centering this on the end of the stem with assistance from a centre in the tail stock and turning the chuck by hand
5. I knurl the head - the pressures generated by this are significant which is why I do it with the thick end of the bar in the chuck
6. I cut part way through with the parting tool at the end of the head and then do the chamfers on the edges of the head.
7. I finish the parting off and voila its finished.

The only disadvantage of this method is that due to bore through my lathe shaft being so small I have to scrap a small bit of bar each time if I start with 3/4", not the end of the world though.

Ed

 

[SeanG]

You make it sound easy Mr Ed. Thanks for the explanation.

Thats a very nice looking set of metal in a lovely looking plane

 

[bugbear]

thanks, I am still trying to find a student to improve it, if you want any of the math I can send you .ps files

which bits are interesting?

Have you been talking to too many Americans? The word is "maths" !

Good stuff on the Bayesian - I had the fun of working with Bayesian IR, long before Bayes was used for spam filters.

We were using Muscat, a commercial spin-off from Okapi.

BugBear

 

[woodbloke]

Have you been talking to too many Americans? The word is "maths" !

BugBear

I spotted that as well but decided to :-# - Rob

 

[wizer]

surely the word is Mathematics ? /pedant

 

[Benchwayze]

A

This kind of thing - http://accuratemfg.com/images/ThumbScrewGroup.jpg

Any thoughts? I've seen a few places online selling them but I only want one and they only sell them in bags!

Thanks

Hi WA,


I'd buy a bag of them myself. Then someday in the future, when someone wanted one, I could earn some beer tokens!

I'll have a search through my tins, trophies and tackle-boxes and see what I can find!

John HTH

PS... I also like the wheel marking gauges, but I can't find a supplier for the cutting-wheels. So I can't make one and my lathe stands idle!

 

[dannykaye]

Have you been talking to too many Americans? The word is "maths" !

I spend half my life on the internet and reading american pages and articles so I guess it has rubbed off but hey, whats in a name

 

[Benchwayze]

Have you been talking to too many Americans? The word is "maths" !

I spend half my life on the internet and reading american pages and articles so I guess it has rubbed off but hey, whats in a name

Quite a bit I'd say; especially when you tell someone you have a degree in 'Mathematic'!

:wink:

John

PS for Woodaddict;

All I could find were four brass thumbscrews, but they were just about 1 cm long and far smaller than M6. (About 1/8" diameter. ) Sorry I couldn't assist.

John

 

[WoodAddict]

no worries, thanks for looking.

I've had a play and I'm struggling with accuracy until I get my bench sorted. chiselling and marking out is too difficult on top of a wonky toolbox :? I may have to make do with a bought one for now. I've bookmarked this thread so I have all the info in the future.

Thanks everyone.

 

[Benchwayze]

no worries, thanks for looking.

I've had a play and I'm struggling with accuracy until I get my bench sorted. chiselling and marking out is too difficult on top of a wonky toolbox :? I may have to make do with a bought one for now. I've bookmarked this thread so I have all the info in the future.

Thanks everyone.

Best o' luck!
John