spirol Pin Removal from Blind Hole
spirol Pin Removal from Blind Hole
(OP)
What's the best way of removing a spirol from a blind hole? The current procedure is to tap into the spirol pin and just pull the tap upwards in the hope that it will have enough grip on the spirol pin. Are there an specific tools for the job?





RE: spirol Pin Removal from Blind Hole
Can you bore it out 1 or 2 mm less than pin diameter? Excess material could then be removed by hand as pin pressure on bore is reduced.
I would be worried tapping and putting in screw would increase pin holding pressure.
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
Ted
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
An alternative would be to just drill out the pin. You may need to do some drilling anyway to allow for a tap to get a grip.
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
removing the spirol pins. I have seen them often in the filler plugs in ball bearing designs, and often two of them, and the approach you are using is done in the field.
I think a tool could be made but it might be specific to a particular manufacturers pin design.
RE: spirol Pin Removal from Blind Hole
... But I rarely use oil for it. Grease works better.
I also use bits of paper towel as pseudo-gaskets.
And a big hammer. Once you've bled out the air, it's just like hitting metal.
One big advantage of hydraulic removal; you can re-use all the parts if you need to, because it doesn't usually leave a mark or make a chip.
Mike Halloran
Pembroke Pines, FL, USA
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
B.E.
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
Extractable dowel pins:
http://www.mcmaster.com/#dowel-pins/=ah2up6
As ajack says, there are a lot of suppliers besides the above, but Mcmaster ships (to my shop) next day typically, which is great for r&d.
The problem with "hydraulic removal" on a spirol (aka roll pin) is the slot up one side, the grease or oil just leaks right past it and you can't get enough pressure to budge the pin. My experience, yours may vary, and it may depend on the pin size.
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
Ted
RE: spirol Pin Removal from Blind Hole
As to getting it out, all you need to get out is enough to be able to get a good grip on it with a set of vice grips. The vice grips not only grip the pin for pulling, but placed strategically, they also compress the pin which reduces the force needed to pull it. I've tapped on more than a few vice grips thusly attached to a roll pin I was trying to get out.
If I had the situation described in the OP, and it could be tapped, I'd tap it for a certain distance, say 50% of the length, and I'd then put a rod into the center of the pin, said rod being about 75% of the length (depth) of the pin and then I'd thread a hardened bolt into the threaded hole and thread it in until it contacts the rod and begins to jack against it which would and then back the pin out - hopefully enough to use the aforementioned vice grips.
Once you tapped the pin, it is junk anyway, so don't worry about what the vice grips do to it.
rmw
RE: spirol Pin Removal from Blind Hole
RE: spirol Pin Removal from Blind Hole
There are a lot of these machines on the surplus market.
http://www.electroarc.com/
http://www.surplusrecord.com/srg/006797.htm