(Red) Makerbot Replicator 1 & 2 Extruder Upgrade, Thingomatic w/MK7 Extruder - Delrin Plunger Replacement: I had real problems using the delrin plunger system so I purchased a spring loaded extruder upgrade but still had a few problems with not having enough pressure from the spring to keep the plastic against the drive gear (slippage). I redesigned a similar upgrade and use a heavier and stiffer spring then what I originally was using.
(2) (Left and Right) (Red) Makerbot Replicator 1 & 2 Dual Extruder Upgrade, Thingomatic w/MK7 Extruder - Delrin Plunger Replacement:I had real problems using the delrin plunger system so I purchased a spring loaded extruder upgrade but still had a few problems with not having enough pressure from the spring to keep the plastic against the drive gear (slippage). I redesigned a similar upgrade and use a heavier and stiffer spring then what I originally was using.
Here we have for sale one Eico brand model 628 conductance-type tube tester. Don't know if this one was built from a kit, or if it was factory-built. The build quality suggests to me that it was factory-made, but who knows?
MACHINERY'S HANDBOOK 12TH EDITION 1943 FOR MACHINE SHOP AND DRAFTING-ROOM A REFERENCE BOOK ON MACHINE DESIGN AND SHOP PRACTICE FOR THE MECHANICAL ENGINEER, DRAFTSMAN, TOOLMAKER AND MACHINIST by ERIK OBERG AND F D JONES
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