[CAUT] Double loop eye forming jig

[Ron Overs]

Jim,

Jig image below.



The small block to the right of centre has a 
groove in it which allows the long knurled 
thumb-screw to tighten the block onto the wire, 
holding it in a centralised position while the 
two coils are formed around the pin by hand 
(using a pair of parallel pliers on the small 
'crank' on the end of wire). The forming pin is 
removable, so that I can turn up a suitable pin 
for making coils to the desired diameter. There 
always will be some spring-back after the coil is 
formed, so the forming pin needs to be smaller 
than the desired final diameter. The springback 
will be less with thicker core wires, and vice 
versa. The small 'crank handle' on the end of the 
wire, and the bend at the coil, are formed with 
parallel jaw pliers before the wire is fitted to 
the jig. The knurled thumb-screw has a long shaft 
made to a specific length, which provides a ready 
reference for determining where to position the 
bends on the wire before making the eye, to 
provide just enough wire to make the job of hand 
winding the coils around the back length segment, 
then bending the tail back to an appropriate 
angle before cutting it to length. When cutting 
the tail to length, its a good idea to keep the 
cutter jaws parallel to the plane of the eye. 
This prevents the sharp edges of the cut-tail 
from damaging the paint work on the plate.

Ron O


>I'd sure like to see that jig for making them 
>that tight. (I do it the old way with round-nose 
>pliersŠ)
>
>Thanks,
>Jim Busby BYU
>
>
>From: caut-bounces at ptg.org 
>[mailto:caut-bounces at ptg.org] On Behalf Of Ron 
>Overs
>Sent: Saturday, May 03, 2008 9:41 PM
>To: College and University Technicians
>Subject: Re: [CAUT] Bass bridge, string scale, cantilevered bridge, tone


-- 
OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
_______________________

Web http://overspianos.com.au
mailto:ron at overspianos.com.au
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