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29th September 2014, 12:46 PM #16
For those of you that don't know , its a little trick the sheeties have.
On some guillotines the sheet sometimes will screw off the cut line,during the cut, and the result is an out of dimension sheet.
To elaborate, the sheet is cut along the marked out line each end for 25 mm or so. Those edges are pulled downwards a bit. The effect is, that the down turned edges hook over the fixed blade and help keep the sheet in alignment to the blade during the cut, ie = cut is on the marked line.
This little nugget of information sure made my life easier at times.
Grahame
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29th September 2014 12:46 PM # ADSGoogle Adsense Advertisement
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29th September 2014, 01:19 PM #17
We used to mark the sheets with left- and right-hand snips but only a ~10mm nick. On a large guillotine, the fixed blade is in front of the moving blade, so you push the sheet into the guillo then pull back and the two nicks would catch on the back of the blade. If your nick wasn't perfectly parallel, you would end up with a little spike left behind to catch on your trousers, or your hand. DAMHIK
"I don't practice what I preach because I'm not the kind of person I'm preaching to."
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29th September 2014, 09:26 PM #18Deceased
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2nd October 2014, 10:46 PM #19
lots of people have the misconception that because a non-ferous metal is "softer" than steel it will be easier to cut.
To start with the 1.2 mm brass is 20% thicker than the mild steel spec and 20% over the capaity of the machine....that is not a small portion..particularly in a machine where the spec's may be ...um...generous.
ALL of the nonferous materials have little quirks that can make them harder to work than steel in the same situation.
A lot of the time it is the "softness" that makes non-ferous hard to cut.
Brass can be a real bastard and its working properties can vary depending on composition.
While brass may have a reputation of being softer and weaker than steel.....it may be a lot less so than imagined.
Of course like most non-ferous sharpness and accuracy in cutting devices pays, bluntness, inaccuracy in edge alignment, deflection in the tool all result in problems cutting brass.
A tool that is sharp, accurate and rigid enough to achieve areasonably clean and efficient cut in mild steel, may not cut clean enough in brass to do so efficiently...that is before you argue about edge geometry.
I was taught that if I wanted to do good work in brass, tools should be put aside for work on brass alone from new.....in particular files....because brass will not tolerate toold that are just a bit off.
cheersAny thing with sharp teeth eats meat.
Most powertools have sharp teeth.
People are made of meat.
Abrasives can be just as dangerous as a blade.....and 10 times more painfull.
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10th October 2014, 02:20 PM #20GOLD MEMBER
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A friend of mine has one of those 3 in 1 tools and he has used it extensively for cutting and forming rust repair panels for cars. The specs as listed are definitely at the upper range of their capabilities, but it performs quite well for what it is.
As Soundman posted, many alloys although perceived as a softer option will astound you as to their mechanical properties.
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10th October 2014, 07:47 PM #21.
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http://www.gumtree.com.au/s-ad/wodonga/miscellaneous-goods/hafco-metal-master-bench-mounted-folder-guillotine-and-roller/1058447068
really keen on getting some rollers for the studio, would be so useful..
does this look sh.t? well i know it's pretty basic but would i even bother enquiring?
Interesting stuff. My daughter sent me the above question last week. She would want to use it on brass, copper and silver. I had to tell her I had no idea. I'll send her a link to this thread.
Thanks
Bob
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10th October 2014, 11:06 PM #22GOLD MEMBER
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Bob,
She has got taste - It is blueCheers,
Rod
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10th October 2014, 11:49 PM #23.
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11th October 2014, 12:04 AM #24Deceased
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11th October 2014, 01:19 AM #25
My experience with small-shop sized metal forming tools has taught me that their makers are usually very optimistic as to rated capacities, especially when working materials thicker than 20 ga.
I bit the bullet and bought a Beverley shear - no regrets.
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18th December 2014, 02:01 PM #26Deceased
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