Jam Peg Instructions

[Glenn Wood]

I recently ran across an old link that was giving instructions to cut a frosted cat design which were listed as “jpeg instructions” from a .asc file, which I am assuming refers to Jam Peg instructions. I’m trying to find any sources of how to read such instructions and convert them to a facet diagram in Gem Cad. I am able to deduce the angle & some of the indexes, however, the middle portions of the listings leaves me at a loss, like “0.56074 40 24 n 2 G Ears” or “0.59273 52 12 n 5 G Whiskers”. Does that mean using index 40 & 24 in the first example and index 52 & 12 in the second example? Here are the instructions:

“Here is a jpeg with instructions for version 3 of the Bobcat:
Here is the data from the .asc files for the Bobcats:
Bobcat #1:
GemCad 4.2
g 64 0.0
y 1 y
I 1.54
H Round Frosted Cat
H by Bob Collins  (GemBob)
H
H 6/4/01 
a 90.00 1.00000 2 6 10 14 18 n G 22 26 30 34 38 42 46 50 54 58 62
a -35.00 0.59274 58 n 1 54 50 46 42 38 26 22 18 14 10 6 G Leave frosted.
a -32.00 0.56074 40 24 n 2 G Ears – polish
a -32.10 0.56074 0 32 n 3 G Leave frosted
a -14.70 0.45413 0 56 48 40 32 24 16 8 n 4 G Cut 32 first – meet P2 and P3 – polish
a -34.20 0.59273 52 12 n 5 G Whiskers – polish
a -10.00 0.45542 0 n 6 G Nose – leave frosted.
a 35.00 0.63917 2 6 n A 10 14 18 22 26 30 34 38 42 46 50 54 58 62
a 25.00 0.50739 0 4 8 12 n B 16 20 24 28 32 36 40 44 48 52 56 60
a 0.00 0.14470 0 n T
F Stone is designed to “Window”
F Mount with high contrast backing
F to enhance cat silhouette.
F”

Thanks in advance for any help with this.
Glenn Wood

[Alan Balmer]

Jpeg usually refers to a graphic format, not jamb peg, and the .asc file bears that out. The .asc file is readable by GemCad, and will give you the instructions and a diagram. Go to gemcad.com to download a free trial of GemCad. If you’re serious about faceting, you should buy it when the trial period is over.

[gemmakermz]

i wasn’t ware anyone would try jam peging. i saw a fellow at a show in so. cal. in 70’s demo it. and there is no indexing, you have a pointed stick/rod of wood with a stone on it and a lap and a vertical tapered spool with holes in it in a spiral. the indexing is you and your hand control of the stick. the closest i got to that so far is i have an o’brein faceting unit which is a controled jam peg system, i learned to facet on it that way. you do the cutting. a true jam peg you do all the cutting and control. the spool helps in setting angle. the spool is arched much like the facette faceter. you master jam pegging and you are a true master faceter. there are places all over the world that still jam peg, thats why many foreign stones dont look so hot nor facets meeting nor in the right uniform position.

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