M series

SP15 issue – uneven inking along length of bed

Not sure why I always run into issues when on deadlines…  Having an issue where I get an impression but there just isn’t any ink on the form and would love to hear any thoughts on what the problem/solution might be.  The uneven inking is happening for the length of the press bed. Was printing …

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Challenge 15MP been in storage for 40 years

I have recently lucked onto a Challenge 15MP that is lightly used and been stored in a dry building for 40 years.  It has some light surface rust but nothing that fine steel wool can’t take care of.  Everything moves and ball bearings seem to be fine. Here’s my question: can I adequately clean and …

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Challenge M Series Worm Gear Fabrication

I am having a new worm gear and crescent fabricated for a Challenge M series press.* I intend to have a couple of extra sets made. The cost per set will be $1,150 with free shipping within the US and Canada. This is less than having a one-off made. The Challenge census lists forty-one 15MA/MP and four 21MP. The gear …

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Challenge 15MP carriage bearing adjustment

Hello all, I made the first adjustments to the lower two eccentrics on either side of the carriage today, gaining a much more even impression across the width of the bed. Special thanks to Gerald Lange, Fritz Klinke, and others for their very helpful posts/articles here on the Blog re: this topic. The remaining issue, …

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Setting Impresion Bearings

Hello All, I’m having a grand old time trying to set the bearings on my Challenge 15mp and it’s been over two weeks of adjusting, proofing and re-adjusting. The main issue I’m finding is that my carriage shifts once the rear impression bearing comes in contact with the rail, causing the rollers to rise and …

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Help with ink distribution roller Challenge 21MP

Hi folks! I’m hoping that your collective knowledge can help with a Ink Distribution Roller issue. I have a Challenger 21MP. I’ve restored it and it is in great shape….except for the Ink Distribution Roller. I’m not familiar with the guide mechanism for oscillating the roller. When I opened the roller I found the shaft …

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