[CR]Re: Pantograph link and yammer


Example: Books

In-reply-to: <MONKEYFOODkmNHQFAnz000008a1@monkeyfood.nt.phred.org>
References:
From: Calvert Guthrie <prairieprinter@mac.com>
Date: Wed, 11 Jun 2008 15:41:53 -0500
To: classicrendezvous@bikelist.org
Subject: [CR]Re: Pantograph link and yammer

Tom, &al.....

For any who aren't already familiar with this applet demo.

http://www.ies.co.jp/math/java/geo/panta/panta.html

It gives you a quick visual of why pantographs work so well.

On the biz end you may afix a pencil or a plasma torch.

A rotary graver was the norm for jewelry and bicycle

components. These days "pantographing" more likely

gets done digitally with a CNC plotter.

The inexpensive wooden drafting pantos are still handy

for any scale-up jobs larger than your printer or scanner.

Some of our classic rides & components may have begun

as an idea sketched out on a scrap of paper in a pub. Back

at the pattern drafting office it could be scaled up using

the shop's workhorse wooden panto. These were usually

bolted at one end to a large flat table and suspended from

the ceiling, just above the paper, w/string & a gum band.

The Dies used to make stamped metal head badges came

from a plaster or wood model scaled down using a panto-

graph. Sometimes the pantograph used is one of the

lathe variety. It's mighty elegant in the way it works but it

would take another screen demo applet to explain it.

BTW: Anyone got a few tapered collets for an H.P. Preiss 2d Panto?

Calvert Guthrie
Kansas City
Missouri
USA