Marvel Model 8 lower wheel replacement...HELP!!

You need to post pictures..

the last marvel 8 series 2 that I worked on had a jam and to locking screws one was used to push the shaft out..

Pin is an alignment pin. Knock it out, then press or drive the shaft out of the housing.

So what I am seeing at the end of the casting is the actual shaft and not just a dust cap?

PCFree50 said:

So what I am seeing at the end of the casting is the actual shaft and not just a dust cap?

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There is a dust cap in the end of the lower wheel casting on the older Marvel 8 machines. I usually try to tap it sideways (on one side with a punch to cock it on the bore) so I can get ahold of it. One you remove that, you are looking at the end of the shaft. Make sure to remove the tapered pin (from the bottom up) and the set screw (which is essentially your lower wheel tracking bolt).

Than get an aluminum or brass bar and go to town!

By the way, when properly maintained and cleaned, this shaft should be easy to install and remove - so make sure the bore is clean and the shaft can slide in easily before you put all that effort in to lifting the new wheel assembly in to place.

--Chris

Thanks, Chris! Do you work on this stuff for a living? Or do you just like machines like the Model-8?

PCFree50 said:

Thanks, Chris! Do you work on this stuff for a living? Or do you just like machines like the Model-8?

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I’ve been a bandsaw tech - essentially a Marvel guy - for 23 years, and I’ve spent my fair share on the bottom side of plenty of Marvel saws!

op got pretty lucky there i'd say!!

Blade not tracking on lower wheel correctly

TS3 Saws said:

I’ve been a bandsaw tech - essentially a Marvel guy - for 23 years, and I’ve spent my fair share on the bottom side of plenty of Marvel saws!

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I followed your advice and cleaned up the inside diameter. The wheel and axle slid in smoothly and pin pulled it into place. I threw on an old blade to line up the wheel and it is tracking way off. almost off the lower wheel while riding up against the shoulder of the upper wheel. Correct me if I'm wrong, the lower wheel alignment is guided by how the blade comes off the alignment guide and rollers that re-align the blade the 90 degrees?


Wondering if I am missing an adjustment or should I add shims here?

I am using the Darcy replacement wheel with axle and the way they machine the axel gives quite the adjustment yet from fully bottoming the adjustment screw to backing it all the way out, nothing changes.

One other thing I wasn't sure if it was off, the inside edge of the casting is right up against the inner bearing race and rubs on the plastic insert of the sealed bearing. Darcy doesn't show a spacer there in their schematics only the ones used with the open bearing in the original design and are listed as "obsolete. Should there be anything between the bearing and the casting boss?