Coach screw head size

Jon Nazareth · Nov 19 2014 13:20

If wooden brake blocks were held onto the hangers with coach screws, does anyone know the size, A/F, of the head, 3/4" or 1"? Or maybe some other size?

Regards
Jon

MikeWilliams · Nov 19 2014 14:33

Jon,

Not sure if this is comparable, but LNWR Webb wooden-framed tenders have wooden brake blocks and steel hangers held on by coach bolts, the heads of which are 3/4in square by 5/8in thick.

Mike

Jon Nazareth · Nov 19 2014 14:37

Brilliant, Mike, that'll do fine.

Regards
Jon

MikeWilliams · Nov 19 2014 14:43

Which sounds to me like a domestic pin held in a pin-vice and the head filed square? At least that's what I used to do to represent larger square-headed bolts in smaller scales. Good job they are square - hexagons are much more difficult to make by hand!

Mike

Jon Nazareth · Nov 19 2014 16:46

Never thought of that idea,

. I ordered some dummy bolts from Eileen's Emporium as soon as I read your message. Never mind, next time.

Regards
Jon

MikeWilliams · Nov 19 2014 17:59

Jon,

When I say pin vice, I actually mean a pin chuck. They have 4 jaws and a brass pin files easily with a flat needle file lined up by eye with the jaws. Looking at the work from the end: File a flat, turn 90degree, file a flat, turn ....

A bit rough and ready maybe, so I then select ones of similar size afterwards.

But I'm sure yours will be better!

Mike

IanT · Nov 19 2014 19:16

A very simple indexing device is a piece of square material drilled through - in this case to fit the pin vice/chuck into, with a grub screw to hold it in place. This method can also be used with larger parts directly.

If you have trouble holding a vice 'level' whilst filing - then a "roller" (which can be just about anything) the same diameter as the height of the part being filed, will help to keep the file level.

Regards,

Ian

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