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#1
05-22-2019, 06:42 AM
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Oxy/Fuel cutting 3/4" plate needs preheated ?
FF to 8:10 I dunno, I just start cutting.....  And when did 3/4" plate become known as "thick" ? 
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#3
05-22-2019, 07:57 AM
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I do preheat 3/4" and thicker plate... If it is something I need a smoother cut line and don't want to do a ton of grinding prep...
But if I am just looking for a severance cut the I won't bother to preheat the material... It does seem to make enough difference when cutting with O/A even when using propane cutting.
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#4
05-22-2019, 09:26 AM
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I never preheat. I find the smoothness of cut is all about consistency of speed, distance from surface, and the correct sized tip for the job.
If you don't jerk and wallow and tilt the torch tip at right angles to the direction of cut it comes out nice. That is hard for some to do because age is stealing our skills.
__________________
Gerry You got freedom of speech, if you don't say too much. Aaron Neville. The virtue is always a cover for the sin. That's the key to understanding the modern left. Whatever they're accusing you of doing, they are doing themselves but more enthusiastically. And that's definitely the story of Justin Trudeau. Tucker Carlson
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#5
05-22-2019, 10:46 AM
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Quote:
That and plasma cutters. I rarely cut with a torch anymore. With the cnc machine, I rarely cut anything by hand anymore. When I was building a regulator station I watched an older welder cut an 8” vertical pipe bevel by hand with a torch. It came out as nice as a machine beveler. There was no fuss about it either, just measured, drew it around with soapstone and cut it. Twas impressive.
__________________
Walker Chief slag chipper and floor sweeper, Ironwood Artistic
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#6
05-22-2019, 11:16 AM
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It’s all perspective. Most of the folks that those videos are really targeted to, probably will handle 3/8” plate max most of the time. 3/4” plate and the proper equipment to work it is not commonplace in home garages.
 Sent from my iPhone using ShopFloorTalk
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Brian You don't know what you don't know.  "It's what you learn after you know it all that counts." John Wooden 
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#7
05-22-2019, 01:32 PM
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Quote:
If I had neglected the mill scale removal option, running the torch up and down the lines to preheat would often times pop the scale off and with it the soapstone layout. Piercing is a different color horse. I could pierce 3/4 preety easy, with only a little preheat. 1" plate took a bit more warming but I could pierce that easy enough too...
__________________
"I was raised with you do things because its what you should do. I never expected anything in return." -----DozerDan
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#8
05-22-2019, 02:52 PM
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Quote:
__________________
Drawing by Smartdraw
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#9
05-23-2019, 04:10 AM
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"after setting myself on fire a few times I made it threw and found it is hard to follow a line with a straight torch but I whittled it out"
Haha, the things we do for fun...
__________________
"I was raised with you do things because its what you should do. I never expected anything in return." -----DozerDan
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#10
05-23-2019, 04:37 AM
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I guess maybe I should have said I preheat because all I have is a victor jr. so no not the proper torch for cutting thicker metals but if I have to plow through thick metal I will pre-drill a hole with the drill and start from there after preheating but I can cut fairly clean up to 3/8" with the V, jr. but prefer to cut with the plasma or band saw whenever I can or it allows...
But I don't find much need for using it for cutting anymore more for heating now than anything.
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