FILENAMES:

FullDomer.jpg
FullDomerToolAndBracelets.jpg

DESCRIPTION:

These are pictures of small jeweler's power hammer.

Posted by Dar Shelton <darshelton@hotmail.com>.  

The following description was provided:

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Basically, this is a custom power hammer affair.

The drive train turns the uppermost horizontal bar , 
and eccentric cams on it contact the nylon tops of the 
two vertical threaded rods. The threaded rods connect 
to the lower horizontal bar, which is the tool-holding 
bar. This bar holds the rounded male punch , cycling it 
up and down about 4x per second.

The punch has a matching female die made of nylon that 
sits immediately below it on the blue I -beam base, and 
as the tool reciprocates, the bracelet strip is fed through 
roughly 1/16" to 1/8"  per strike. This gives the bracelet 
strip convex curvature (looking from the outside) along it's 
length and the desired domed cross section. 

Considerable care is taken fine tuning the tool sets so that 
the fronts of the strips have no ridges , are therefore easy 
to finish, and when polished , have a nice, uniformly rounded 
reflective surface. 

Motor is a 1/4 hp dc gearmotor . Brass threaded rods screw 
through cams to aid in cooling. Tool bar travel is adjusted 
to about 3/16" , and this lessens the contact time of cam/nylon 
pads,  and makes it difficult for fingertips to fit between tool 
parts, and facilitates the strip curling around the tool bar. 
Male punches are cast bronze , made (rubber molds, lost wax cast) 
from hand ground steel masters off of a manually operated domer 
built previously, and have mounting tabs of steel brazed on. 

Dar Shelton