Doc's Machine & Airsmith Services


Doc's Machine- the Mad Scientist of Paintball
[ Return to Main Page ] [ Return to Projects Index ] [Doc's Machine & TWB Store] [ Contact Us ] [ The Whiteboard Webcomic ]

Rebuilding and Upgrading a Jet JMD-20VS Mill-Drill, Part 5:


Jet Mill-Drill

Moving on to the second half of the drive assembly, we have this ugly lump. Filthy with dried grease,
thirty-year-old Cosmoline, belt-dust and just general gunk, and of course all five (!) of the bearings are bad.
Which means that all eleven bearings, between the motor (but not counting the motor itself)
and the spindle, were bad. No wonder this thing made noise.

Jet Mill-Drill

Anyway, press out the old...

Jet Mill-Drill

And press the shaft out of the stack.

Jet Mill-Drill

Press the adjuster fork thingamadoojobber off the other end...

Jet Mill-Drill

Pop the snap rings...

Jet Mill-Drill

And press those bearings out too. So far none of the bearings I've removed were sealed- they were all
just shielded, and only on one side. Was that some kind of cost-cutting measure?
Two and a half cents per bearing to skip the shield?

Jet Mill-Drill

Said fork thingie pushes on this bearing, which has a steel cap/plate- the fork pushes
this down or lets it up, so the belt can move about on the pulley.

Jet Mill-Drill

After cleaning the parts (no photos, as I don't want to slobber dirty solvent all over my camera)
we stack up the drive spindle bearings with their spacers...

Jet Mill-Drill

Like so...

Jet Mill-Drill

And press it all back together again.

Jet Mill-Drill

The upper half of the pulley gets its pusher bearings- sealed this time.

Jet Mill-Drill

And then it all slides onto the spindle.

Jet Mill-Drill

The pusher cap...

Jet Mill-Drill

The forkamadoowhacky, freshly cleaned and with its new bearings...

Jet Mill-Drill

Stacked up and ready to install!

Jet Mill-Drill

Then it was a simple matter of just setting it in place, and bolting it down.
(Lightly snugged, as we'll have to adjust the belts shortly.)


Previous Page
Projects Index
Next Page



eXTReMe Tracker

All text, photos and graphics Copyright 1998- 2018, Doc's Machine & Airsmith Services. All Rights Reserved.
Information contained in these pages is for reference and entertainment purposes only.  Our methods are not always the best,
quickest, safest, or even the correct ones. It's up to you to know how to use your own machines and tools.
Keep your fingers away from the spinny blades o' death and you should be all right.