T-20 drums and shift pins

[Roger S]

OK I read the t20 write up, so now I have an idea of how it works. The thing has no band adjustment other than the plunger travel, with the fixed anchor rod. Great idea, if you're a mfg selling replacement parts.

Unless you can get creative and move the band anchor, I don't see a way to take any OD off the drums.

[jerseybigfoot]

You can always cut the loop off the band and reweld it.

[brushcutter]

Thats what RC and I talked about and I guess I should have clarified ("do i smell burning bands?") If you took any off the drums several things could go wrong really quick, such as plungers pulling out causing fliud loss, burnt trans parts due to lack of fluid. I guess you could say that a little bit off the diameter of the drums means a lot to the bands.

But now you've got me thinking,... I'm liking Jerseys steel ring idea... so what do you think about this, test drums for hardness... order sleeves that are the same... turn drum down to necessary size... freeze drum to shrink...press ring onto drum...then turn drum to spec.

Whipper, how did the useable drums work out or is the jury still out on it?

[whipper-ag]

Joe just got the drums back on Friday. He'll have to let us know if they work. The pics of what they drums looked like when he took them out are posted in the Max forum RI thread that he started.

Whipper

[racerone3]

hey brushcutter, did you ever get a chance to rockwell a shift pin? i bought a set a few weeks back and measured them before i put them in. they are the same diameter as the shank on a bowman 1/4-20 bolt... just wondering how they compare from a hardness standpoint. if they are similar, it would be easy to cut a bolt and round the ends a little bit to make a few spare pins. i don't have access to a rockwell tester right now so i can't look into it myself.

[brushcutter]

Whoa! Almost missed your question there Racer. Ya almost gotta check in every hour to keep up, WOW threads move really fast these days.

Never did, seems like I remember that all mine were stuck pretty good, and I didn't want to risk damaging them trying to pull them out of the plungers. The guy that runs the tester is semi retired, so it will probably be a few days before I can get a result. I"ll see if we can test them without removing them from the plunger. We have a multitude of grade 8 bolts, so we'll test one of them also to see how close they are to each other. If anyone wants to donate a damaged drum for testing, PM me and I'll send mailing info.

[brushcutter]

BTW we now have a "spray welder" and we have tested the hardness of some of the parts we welded with it, they test at 32 to 34 which is fairly consistent. No more difference than this could be caused by the air temp as they cooled. They will almost scratch with a grey scotch-brite pad, pretty soft, relatively speaking.