In letterpress printing it is often necessary to check the diameter of various rollers in the press. In general the rollers that transfer ink eventually to the forme have to be of a consistent diameter so that the ink is…
Category: Challenge MA15 Proof Press
Challenge Proof Press Lockup Bar Working
My previous post described my confusion as to how the lockup bar for my Challenge proof press works. As I mentioned in a comment to that post, I found my answer online in US patent number 3288062 which shows how…
Challenge Proof Press Lockup Bar
One part of my Challenge MA15 proof press that I cannot figure out is the lockup bar, used as a quick way of clamping the type in position on the bed. The bar has a locking lever which turns an…
Rubber feet for the Challenge Proof Press
Proof presses are subjected to a lot of sideways forces when used, caused by the carriage hitting its stops at either end of its stroke. These can be reduced by slowing down near the end of the stroke, but there…
Putting a back on the Challenge Proof Press
When I got this press earlier this year, I printed off a nice copy of the instructions. Challenge Machinery still exists, and their web site is quite useful in that they seem to be trying their best to have manuals…
A New (to us) Press
Last Friday we picked up our newest press, a Challenge MA15 Proof Press S/N 5338. This model was a copy of the popular Vandercook SP15 press, which Challenge eventually had to stop selling because of issues of patent infringement. We…