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Stub Mandrel04/03/2012 21:26:57
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4318 forum posts
291 photos
1 articles

Heathen! Cylinder cover fixings should always be hex nuts on studs!

But when using slotted screws, treat each alternate screw as the left and right flags in a semaphore and spell out a rude message to the rivet counters.

Neil

Bazyle04/03/2012 21:32:40
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6956 forum posts
229 photos

Correct! it was a trick question hence the devil smiley as I'm sure you realised. I like the semaphore sentiment.

jason udall05/03/2012 02:06:43
2032 forum posts
41 photos

I rember when showing all fasteners at [say] 12 oclock was conidered lazy in DO

Just saying

Tel05/03/2012 07:12:03
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157 forum posts
28 photos

As long as I can remember it has been a sign of quality work - and this bloke seems to agree.

I tend to do it on work that will be visible.

Axel05/03/2012 14:51:31
126 forum posts
1 photos

I'm trained in gunsmithing, when making fitted screws, or pins as they are called in the British gun trade, the slot is made last. the head is left too tall until its ready to be filed down. First the screw is tightend then a mark is made and the screw removed, a slot is made, and the screw refitted and filed. Most screws on shotguns are made thus, since no standard screws would fit the shape of the body of the gun.

Ian Abbott05/03/2012 16:09:25
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279 forum posts
21 photos

"...- and this bloke seems to agree."

Nah, the slots should be vertical. And he's even used those 'orrible crappy Canadian Robertson screws in the bottom picture. Now there's a screw to avoid, either the bit spins when the screw's half way in, or you can't get the bloody bit out when the screw's flush.

Ian

Michael Gilligan05/03/2012 16:58:13
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23121 forum posts
1360 photos
Posted by Axel on 05/03/2012 14:51:31:

I'm trained in gunsmithing, when making fitted screws, or pins as they are called in the British gun trade, the slot is made last. the head is left too tall until its ready to be filed down. First the screw is tightend then a mark is made and the screw removed, a slot is made, and the screw refitted and filed. Most screws on shotguns are made thus, since no standard screws would fit the shape of the body of the gun.

Axel,

Thanks for the insight ... I knew about the Horologist's method [cutting back the underside of a cheese-head], but not this.

MichaelG..

Jon05/03/2012 21:42:58
1001 forum posts
49 photos

I wll confirm as Axel stated thats how its done, it used to p me off something i couldnt do well was get the slot in the middle, no problem with the angle.

Of course after hardening of the screws they wont line up after either.

We used to supply to the trade in the white, by the time others did their part,the screws never lined up, certainly on the bridles with each screw marked for position and LH or RH.

Ian P05/03/2012 22:04:06
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2747 forum posts
123 photos
Posted by Axel on 05/03/2012 14:51:31:

I'm trained in gunsmithing, when making fitted screws, or pins as they are called in the British gun trade, the slot is made last. the head is left too tall until its ready to be filed down. First the screw is tightend then a mark is made and the screw removed, a slot is made, and the screw refitted and filed. Most screws on shotguns are made thus, since no standard screws would fit the shape of the body of the gun.

Axel

Please could you elaborate what you mean about no standard screws being the right shape. Also when I searched I could find no reference to 'pins' (other than for firing purposes).

Ian P

Jon05/03/2012 22:11:11
1001 forum posts
49 photos

Each screw is sized to the hole diameter, left proud and tightened up. A thinned down saw blade is used to cut the slot without marking the surrounding job.

As the screw is proud it will then be filed in soft or hardened state to the contour of the part the screw its fitted to. ie on a lock plate its flat but has to be level or fractionally left proud a couple of thou. On a trigger guard these are radiused if you like and have to be filed to the strap which attaches to the inletted woodwork. This is not a domed screw.

Most English still use BA by the way.

Axel06/03/2012 00:02:32
126 forum posts
1 photos
Posted by Jon on 05/03/2012 22:11:11:

Each screw is sized to the hole diameter, left proud and tightened up. A thinned down saw blade is used to cut the slot without marking the surrounding job.

As the screw is proud it will then be filed in soft or hardened state to the contour of the part the screw its fitted to. ie on a lock plate its flat but has to be level or fractionally left proud a couple of thou. On a trigger guard these are radiused if you like and have to be filed to the strap which attaches to the inletted woodwork. This is not a domed screw.

Most English still use BA by the way.

Indeed, and even those that are domed or flat are often made so they line up. One must be careful not to over tighten them, its a sin that ruins the screw.

Many screws are left soft though, only if the gun has colour case hardening is it much of a prob.

A pin is a normal half threaded screw, and a screw-pin a full threaded screw, if I recall correct. I doubt one can find any info about this on the net though.

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