That precision chisel-and-hammer method looks like a fine thing to discover, maybe, uh, 76 years later.
I believe the current Ridgid-brand spiral pipe-reamer instructions mention using it for KO upsizing. The MegaSlugSlammer KO punches are nice, but believe me, in their day ball-bearing drive screws and then the 2-handle ratchet driver were great improvements too.
Re: 1927 KO Puller#151910 06/01/0306:27 PM06/01/0306:27 PM
txsparky, Hydraulic KO punch? Sounds like something that Mike Tyson would use. I still use the old holesaw and arbor in an Electric drill to cut holes in panels. Takes some skill if the panel is live and full of 400V wires, although I've never struck a wire.....YET!.(Touching all the wood I can find!) I've been present when someone has though!.
[This message has been edited by Trumpy (edited 06-01-2003).]
Re: 1927 KO Puller#151911 06/03/0304:23 PM06/03/0304:23 PM
Not sure about the battery operated one. I have the the one with the hydraulic foot pump.I believe at the time it was purchased it was around $1200. It will punch up tp 4" holes. I also have a smaller hydraulic that punches up to 2" ($550) and a ratchet set that punches up to 2" that I found at a pawn shop for $125.
Re: 1927 KO Puller#151914 06/06/0311:31 PM06/06/0311:31 PM
txsparky, Thanks for that. I work on panels quite regularly and a tool like this would really come in handy. I like the idea of the foot pump (leaves both hands free). I might look into getting one of these.