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Gents,
I've seen a few folks do this in the past, and was always a bit intimidated by the risks involved.
Last night a friend brought over a differntial case / leaf spring mount for his '61 corvette - with a 1/2" bolt sheared off even with the casting - he had drilled the bolt out and tried an ez out with no luck.
I first tried heating up the remainder of the bolt with the torch - then tried a couple differen ez outs with no luck.
Knowing that these things don't exactly grow on trees - I was a bit intimidated to attempt "blowing out" the bolt with the torch, but it appeared to be our only remaining option.
I've used a torch a bit - but am by no means a pro - I use a smith handle with three tubes to the head - no valve for the cutting oxygen, with a zero size tip.
I turned the acet regulator to 5lb, and the oxy to about 25.... not enough power.
I turned them both up a little - finally reaching about 8lb acet, 40lb oxy....
I managed to blow out the torch a couple times while trying to cut out the bolt - it was in a blind hole - so all the molten steel was being blown right back out of the hole at the torch tip.... I ended up cleaning it a few times.
After 3 blow outs - I managed to get all the bolt out and cleaned the hole (the remaining slag was brittle and easily removed with a pick or chisel) then ran a tap through it.
What pressures / tip sizes / techniques do you experienced torch handlers use for this process?
I've seen a few folks do this in the past, and was always a bit intimidated by the risks involved.
Last night a friend brought over a differntial case / leaf spring mount for his '61 corvette - with a 1/2" bolt sheared off even with the casting - he had drilled the bolt out and tried an ez out with no luck.
I first tried heating up the remainder of the bolt with the torch - then tried a couple differen ez outs with no luck.
Knowing that these things don't exactly grow on trees - I was a bit intimidated to attempt "blowing out" the bolt with the torch, but it appeared to be our only remaining option.
I've used a torch a bit - but am by no means a pro - I use a smith handle with three tubes to the head - no valve for the cutting oxygen, with a zero size tip.
I turned the acet regulator to 5lb, and the oxy to about 25.... not enough power.
I turned them both up a little - finally reaching about 8lb acet, 40lb oxy....
I managed to blow out the torch a couple times while trying to cut out the bolt - it was in a blind hole - so all the molten steel was being blown right back out of the hole at the torch tip.... I ended up cleaning it a few times.
After 3 blow outs - I managed to get all the bolt out and cleaned the hole (the remaining slag was brittle and easily removed with a pick or chisel) then ran a tap through it.
What pressures / tip sizes / techniques do you experienced torch handlers use for this process?
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