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Member postings for Siddley

Here is a list of all the postings Siddley has made in our forums. Click on a thread name to jump to the thread.

Thread: DAS modelling clay - uses ?
20/11/2012 18:45:36

My missis found blocks of DAS modelling clay on offer at a local shop and bought me some on spec.

I can't really think of any engineering use for it though, does anyone have any bright ideas ?

Can you use it as a mould for casting small parts in brass ? that's about the only thing that comes to mind.

Thread: Gratton Model Engineering, Derbys
20/11/2012 11:59:45

That's sad news.

20/11/2012 02:41:55

Are they still in business ? - I had some good deals from Des and his crew back in the day. Quite a grumpy guy but heart of gold really.

I liked the way they didn't freak out when I mentioned I was a gunsmith, that and the offcuts of dural lurking in the pick and mix area :D

Edited By Siddley on 20/11/2012 02:43:54

Thread: Small bore gauge ?
20/11/2012 01:04:12

Clive - I'm going to make the barrels myself. The idea of a smoothbore terminated with a rifled extension dates back to WW-2 I think ? I'm sure there was an anti-tank gun which used that concept. Have you heard of the UK airgun company called Theoben ? the 'Ben' in the Theoben name is a friend of a friend. I don't claim to know him, I think I have spoken to him maybe twice on the phone. A very talented guy ( in my opinion at least ) - last I heard he had left the company and was making microgroove barrels. I'm quite interested in that technology.

David - Never apologise for being pedantic when it comes to firearms legislation. It's always good to stay out of jail ( even if you are a biker who probably has more tattoos than the inmates, like me   

I actually had an L42A1 air cartridge replica on my FAC ( I had an FAC as well as an RFD, it's not the done thing to mix business with pleasure )  which I built from one of the old Saxby-Palmer Enfields - the barrel was from a shot out target rifle, bored out to take a .22 liner and still retained about half an inch of the original rifling at the muzzle. It really looked the part but wasn't much practical use.

I've got quite a collection of Brocock guns here. Two of them are revolvers which started life as Weihrauch Arminius in .38 special, another two are Uberti single action Colt clones, there are two others which are monkey metal junk, a Predator rifle, the 'Fox', and a Uberti 1866 Yellowboy.

I'm tempted to design a new cartridge which is capable of supplying more muzzle energy - the legal limit for airguns in Spain is 18ftlbs and the BACS gave something like 10ftlbs out of a rifle barrel.

I hope talking about ( legally owned ) guns is OK on this forum ( I don't intend to make a career out of it ) - if not then please will a moderator tell me to shut up ? smiley

Edited By Siddley on 20/11/2012 01:05:12

19/11/2012 21:53:10

What a helpful and interesting post Clive, thanks a lot.

Just so you know - I was a licenced gunsmith ( RFD ) in the UK before emigrating to Spain, but never got into the finer points of bore versus bullet size. Unless you are doing work for the muzzleloading guys it doesn't really come up.

I want to experiment with different bore sizes, tapered bores and microgroove rifling. Airguns seem to be extremely fussy about pellet sizes and I'd like to try and find out why. I also have a commercial reason as the ( now prohibited in the UK ) Brocock air cartridge guns are VERY popular here. I'm intending to make a few BACS rifles and pistols from scratch, something I did in the UK before they were effectively banned.

I'd also like to do some model engineering, but I have been saying that now for at least 15 years and all I have to show for it are good intentions. Maybe I'll just keep reading about it instead

19/11/2012 16:58:45

Thanks for jogging my memory Michael, you reminded me that there is a product sold in the USA called 'Cerrosafe' which is intended for making castings of the chamber in a firearm barrel, so it can be more easily measured.

It's a proprietary formula, but I bet it's very similar to Woods metal...I'll have to see if I can get some

I think a Moore and Wright gauge from Ebay will be my first port of call though

Edited By Siddley on 19/11/2012 16:59:20

19/11/2012 15:55:44

Thanks David ( I understand the moderating, I know what a pestilence spammers can be on forums )

I had seen the ball ended bore gauges but didn't really know if they were up to much. I'll have to get some sent over from the UK with my next 'care parcel' of engineering goodies then.

19/11/2012 15:23:20

Hi folks. I'm a gunsmith by trade and I have decided it might be fun to make my own barrels. Initially these will be for airgun use as I don't yet have the permit needed to manufacture firearms here in Spain.

I'm OK on the deep hole drilling and the rifling machine, what I haven't yet figured out is a good method of measuring the bore of the barrel. I can " slug " it with molten lead, but that's not always accurate because the lead contracts as it cools. What I would like to do is make a bore gauge, but I'm having trouble coming up with a design. It doesn't have to have much of a range as the two calibres I'll be working with are nominally .22 and .25. The accuracy would need to be in the order of .001 in

Does anyone have any bright ideas as to how I could make such a bore gauge ?

Thread: Drill Sharpening Jigs - Advice please.
19/11/2012 13:04:51

Hello all, my first post here ( doesn't seem to be an area for new member introductions, so this is it )

Is there any consensus about drill sharpening methods ? I'm lucky as regards smaller drills, having bought a huge collection in 0.1mm increments from the estate of a deceased model engineer ( a bit of a sad way to get them really ) Drills over about 6mm however are going to become a problem soon as I now live in a rural area of Spain and quality drill bits are VERY expensive ( as is anything engineering related )

While I can sharpen a drill freehand the resulting hole is unlikely to bear any resemblance to the size stamped on the shank. Sometimes it doesn't even resemble a hole

I'm thinking of upgrading my grinding rest to controlled feed and building the four facet jig described in MEW 142 - does that sound like a good plan ?

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