Direct drum machining

[jimski]

My friend says that the drum needs about 10 to 15 cut off it so it is flat for s wide band.

Is this too much or is it ok within that spec.

 

[gusszgs]

I would only machine the necessary amount to make the drum tru and straight

 

[Steve V]

Rather have a flat drum and a stock width band. The anchors don't extend to the edges. It can curl. Carbon band and stock width with a sonnax servo.

 

[bison]

Rather have a flat drum and a stock width band. The anchors don't extend to the edges. It can curl. Carbon band and stock width with a sonnax servo.

This. Taking a .015" cut will ruin the drum. .005" will be .010" off the diameter and I won't even use a drum below 6.565" in a high performance build


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[achalmersman]

How much does wear like this bother you guys? Talking about the notches that engage the sun shell.

 

[Steve V]

How much does wear like this bother you guys? Talking about the notches that engage the sun shell.

Weld those up and file smooth.

 

[jimski]

I would only machine the necessary amount to make the drum tru and straight

Is 10 to 15 thousands too much

 

[achalmersman]

Weld those up and file smooth.

Ok thanks. I will have somebody repair this for me and keep it. For right now I'm ordering a NOS drum I've my my sights on. I'll get this one repaired and keep it. Didn't realize they were this difficult to find and in my searches I've seen Bison mention the lack of QC on the reman ones.

 

[jimski]

This. Taking a .015" cut will ruin the drum. .005" will be .010" off the diameter and I won't even use a drum below 6.565" in a high performance build


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If he takes 15 thousand of it can it still be used in stock application? He says its that bad.

 

[gunzandgearz]

Just curious how is he coming up with this figure

 

[bison]

If he takes 15 thousand of it can it still be used in stock application? He says its that bad.

That's .030" off the diameter and would probably wind up in the scrap pile. You have to consider the lug position at engagement and the servo travel required to apply. The servo may bottom out or the band end may butt. The trans wasn't designed to be able to accommodate a large variation in drum diameter. I'd bet that the pins are selective because the bands varied not the factory cut on the drum. 6.580" plus of minus a couple is typical. 6.550" run the other way


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[jimski]

That's .030" off the diameter and would probably wind up in the scrap pile. You have to consider the lug position at engagement and the servo travel required to apply. The servo may bottom out or the band end may butt. The trans wasn't designed to be able to accommodate a large variation in drum diameter. I'd bet that the pins are selective because the bands varied not the factory cut on the drum. 6.580" plus of minus a couple is typical. 6.550" run the other way


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This drum I'd definitely junk anyways then if he claims that will make it flat. Check you're pm.

 

[INEEDAGN]

You guys just mig welding the tabs back up or are you using specific process/material for the job?

 

[bison]

You guys just mig welding the tabs back up or are you using specific process/material for the job?

TIG and then re-machining the slot in a Bridgeport.


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