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21st January 2013, 08:59 PM #1
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Plasma cutter with concrete saw question
G'day all, This is my first post so thanks in advance for any advice. I've got an interesting problem. I want to cut a hole in the bottom of my shed out back to create a cubby hole for storage but the thing is its about 50mm of concrete sandwiched in between two pieces of 20 mm steel. I was playing around with the hypotherm a few years back and made it like this out of boredom and spare parts so I'm to blame. Should I prime the cut (a 20cm by 20cm square) with my 50 amp plasma cutter before I take a concrete saw to it or just hire out a concrete saw and take care of it all with that. I've never used one before but know they're fairly powerful. Cheers
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21st January 2013, 10:36 PM #2
Blacksmith, Cabinetmaker, Machinist, Messmaker
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Welcome Goldengram11
I have only ever used demo type saws, but i know that diamond blades designed for concrete don't like steel too much, i think they get too hot, but i know that the diamond can just disappear before your eyes. The hire places normally charge by the mm for diamond wheel wear. If you go for a reinforced abrasive wheel you will get there but it will take you some time, just use a steel wheel (or 3) to get through the steel and then change to a masonry one. Good luck1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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21st January 2013, 11:01 PM #3
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Welcome Goldengram11
Confused*.......sounds like a safe to me.
Originally Posted by Goldengram11
Am I missing something again?
Got oxy/acetylene?
Stuart
*not unusual
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21st January 2013, 11:07 PM #4
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oxy/acet won't cut it, it'll just keep popping and blowing back, tiz hard to cut laminated steel with a torch let alone throwing conka into the mix.
If it were me I would try gouging rods, do you have an arc welder Goldengram11 ?
john
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21st January 2013, 11:31 PM #5
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I was thinking more like thermal lance. But you need oxy to run it and oxy/acetylene would sure help lighting it.
Could be a little messy thought
Stuart
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21st January 2013, 11:37 PM #6
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Yeah Stu, exothermic lance, hehe, they thow the hot stuff thats for sure
I think you can get them going with a car battery and jumper leads ?
I have seen them but never had a play.
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22nd January 2013, 09:17 AM #7
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I appreciate the advice lads but this project might be more trouble than its worth by the sound of it. Maybe I was just looking for an excuse to play with a consaw and the plasma
Still, part of me likes the idea of figuring on how to accomplish the task now that its presented itself. I'll take pics if I can get around to turning up my digital camera since my phone's is #####. Then you could see exactly what I'm talking about.
Cheers,
Graeme
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