lbhsbz
Well-Known Member
- Joined
- Jan 11, 2010
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Working on a brake caliper for a 1964 Maserati 5000GT…one might say it’s a bit rare. One of the pins was fucked up that held the parking brake arm on the caliper…had to be drilled out. I’m pretty sure it was about 1/2 sheered, but nothing made any sense while I was trying to extract it. Ended up with a fucked up hole in the casting.
Who knows what iron this is…some sort of ductile I imagine.
Fixtured it in the mill vise using the 2 good hole with appropriate sized drills as pins to get it straight, then bored everything out to 1/2”…almost cleaned up the holes…close enough at least..
Turned up a chunk to snug/slip fit….material was getting pretty thin so I didn’t want to risk cracking it with a press fit.
Chopped it off, chamfered the ends, and TIG brazed it in place with SiBr filler…which is my go-to when I have no idea what materials I’m working with. Did a pre-heat and a post heat and held my tongue just right…and it didn’t crack. I got lucky.
SiBr is harder than woodpecker lips…can’t hardly drill though it. Had to use a 1/4” carbide endmill to make my pilot hole, but it all worked out. Just happened to have a screw machine length drill in the right size to finish the hole…then chopped out the middle part and machined the gap to size…works like a champ after a bit of “blending” on the EXL wheel.
Who knows what iron this is…some sort of ductile I imagine.
Fixtured it in the mill vise using the 2 good hole with appropriate sized drills as pins to get it straight, then bored everything out to 1/2”…almost cleaned up the holes…close enough at least..
Turned up a chunk to snug/slip fit….material was getting pretty thin so I didn’t want to risk cracking it with a press fit.
Chopped it off, chamfered the ends, and TIG brazed it in place with SiBr filler…which is my go-to when I have no idea what materials I’m working with. Did a pre-heat and a post heat and held my tongue just right…and it didn’t crack. I got lucky.
SiBr is harder than woodpecker lips…can’t hardly drill though it. Had to use a 1/4” carbide endmill to make my pilot hole, but it all worked out. Just happened to have a screw machine length drill in the right size to finish the hole…then chopped out the middle part and machined the gap to size…works like a champ after a bit of “blending” on the EXL wheel.