slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Cutting thick(ish) metalslater
@slater
Club Retro Rides Member 78
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Mar 17, 2020 10:20:38 GMT
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Did anyone mention slitting discs 🙄
Schools have CAD now yeh? Bloody hope they would do anyway! Draw it and send it to a local place to be cut with a cnc plasma or laser. You are curse word in the wind trying to cut stuff like that with a grinder unless you want to to take you ages and look amateurish. Stright lines are ok but start getting too many curves and it gets tricky. There are some online suppliers of laser cutting now. It's cheaper if you can supply a CAD drawing tho. Manual plasma cutters are ok but hard to be accurate even with a template.
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,712
Club RR Member Number: 34
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Cutting thick(ish) metalDez
@dez
Club Retro Rides Member 34
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Mar 17, 2020 12:48:16 GMT
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See I’d happily whittle that up out of a bit of 6mm (and regularity do, if not 8 or 10mm as well) but to everyone else that’s way too difficult as it can’t be done in 20 mins without any physical labour involved.
Whilst i appreciate there are ‘better’ ways to do it these days, the idea they’re any quicker goes out the window unless you happen to have major money CNC equipment in your shed for making the odd one off bracket, as you have to get other people involved.
I like to view it as preserving a dying art. In the 50s and 60s if you did an engineering apprenticeship, you spent the first few months learning how to make stuff with little more than a hacksaw, drills and files before you were allowed onto the proper machinery. And by ‘make stuff’ I mean make the tools you were going to use to make other stuff, and they had to be super accurate.
I quite enjoy doing such things, there’s something quite therapeutic about putting a finish on something with a file, and it teaches you how to use your tools properly. This is something I’m also quite big on, it isn’t until you see other people trying to do stuff that your realise more than 3/4 of the people who own a hammer, a hacksaw and a hand file don’t actually know how to use them correctly/most effectively.
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Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
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Cutting thick(ish) metalPhil H
@philhoward
Club Retro Rides Member 133
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Mar 17, 2020 13:06:15 GMT
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Assuming you’re going to knock a temporary one out of MDF/plywood (easy with a coping saw) then mark out on steel and try the “join the dots” method using a GOOD hole saw, then hacksaw/grinder to rough it, followed by a session with a die grinder? Use carbide cutters, not a grinding stone though!
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stealthstylz
Club Retro Rides Member
Posts: 14,840
Club RR Member Number: 174
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Cutting thick(ish) metalstealthstylz
@stealthstylz
Club Retro Rides Member 174
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Mar 17, 2020 13:46:09 GMT
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For that sort of shape I usually rough it out with a skinny cutting disk then use a normal thickness cutting disk perpendicular to the line you're cutting to get closer to the shape, then finish with a file.
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Phil H
Posted a lot
Posts: 1,448
Club RR Member Number: 133
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Cutting thick(ish) metalPhil H
@philhoward
Club Retro Rides Member 133
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Mar 17, 2020 13:47:31 GMT
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All depends on the shape - the outside is easy to get at
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stealthstylz
Club Retro Rides Member
Posts: 14,840
Club RR Member Number: 174
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Cutting thick(ish) metalstealthstylz
@stealthstylz
Club Retro Rides Member 174
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Mar 17, 2020 21:39:57 GMT
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The inside of that would be the easiest bit, couple of hole saw holes then a slitting disk.
There must be YouTube videos about how to use a file properly. It's something I'm glad I was taught, most of the movements are counter-intuitive I think judging by watching some people at work trying to use them.
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,712
Club RR Member Number: 34
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Cutting thick(ish) metalDez
@dez
Club Retro Rides Member 34
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Mar 17, 2020 22:43:29 GMT
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The inside of that would be the easiest bit, couple of hole saw holes then a slitting disk. There must be YouTube videos about how to use a file properly. It's something I'm glad I was taught, most of the movements are counter-intuitive I think judging by watching some people at work trying to use them. I’ve just had a look, there’s loads. A lot of them over emphasise unimportant things for the wrong reasons, but most do show reasonable technique. Also none of them made any mention of funny file names, I was rather disappointed.
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Most people wouldn’t know the difference between a ba$tard and a second cut,let alone the difference between a Warding and a Riffler...🤔
Whilst many may consider me extremely lucky to have pretty much everything cnc at my disposal,give me a manual lathe or mill job any day....It’s therapeutic 🤣🤣
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Last Edit: Mar 18, 2020 3:29:14 GMT by Deleted
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There's clearly more to filing than I thought. On a similar matter (though not relevant to this thread) I was surprised how much I learned when I watched a video about how to use tinsnips properly. Straight away, edges that I cut with snips are much, much neater.
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Also none of them made any mention of funny file names, I was rather disappointed. I remember my metalwork teacher at school getting exceedingly annoyed at the juvenile titters around the workshop!
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ferny
Club Retro Rides Member
Posts: 984
Club RR Member Number: 13
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Cutting thick(ish) metalferny
@ferny
Club Retro Rides Member 13
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Mar 20, 2020 20:09:05 GMT
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Well, a thing arrived today. 🙂 I'll reply properly when I can and also update you all. Thanks for all the replies!
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Mar 20, 2020 21:08:01 GMT
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not condoning using out of date carborundum discs.... but ive never had an issue.
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'80 s1 924 turbo..hibernating '80 golf gli cabriolet...doing impression of a skip '97 pug 106 commuter...continuing cheapness making me smile!
firm believer in the k.i.s.s and f.i.s.h principles.
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Mar 25, 2020 14:28:53 GMT
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Also none of them made any mention of funny file names, I was rather disappointed. I remember my metalwork teacher at school getting exceedingly annoyed at the juvenile titters around the workshop! I had a similar amount of annoyance when I was discussing butt welding with a group a few months ago. "Why would you want to weld up your butt?“
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1968 Cal Look Beetle - 2007cc motor - 14.45@93mph in full street trim 1970-ish Karmann Beetle cabriolet - project soon to be re-started. 1986 Scirocco - big plans, one day!
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drseg
Part of things
Posts: 142
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side cutting drills work sort of, and for tool abuse a router fitted with a milling tool bit works if you are super gentle and remove material very gently
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interested to see how well that plasma works , thank you .
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ferny
Club Retro Rides Member
Posts: 984
Club RR Member Number: 13
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Cutting thick(ish) metalferny
@ferny
Club Retro Rides Member 13
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It didn't! 😆
Sent it back and got a refund. I used diamond metal discs and the normal style to rough it out in the end.
I'll probably get another in the distant future but will save up and certainly get something a lot more expensive.
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OGDB
Part of things
Posts: 544
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Have you sorted this? I may potentially be able to do this for you, not with a splitting disc or chain drilling though!
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,712
Club RR Member Number: 34
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Cutting thick(ish) metalDez
@dez
Club Retro Rides Member 34
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side cutting drills work sort of, and for tool abuse a router fitted with a milling tool bit works if you are super gentle and remove material very gently I need to do a thread on machining aluminium with a router. I did a experiment with pretty amazing results. You don’t even need special bits.
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drseg
Part of things
Posts: 142
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you do need space face mask hat and gloves as it chucks swarf everywhere, wood router bits will cut aluminium, not meant to but its a tool and theres a job to be done often tools get abused!
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Jun 10, 2020 17:42:57 GMT
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Also none of them made any mention of funny file names, I was rather disappointed. I remember my metalwork teacher at school getting exceedingly annoyed at the juvenile titters around the workshop! Tell me about it, the novelty of being legitimately allowed to use a "naughty word " usually lasted at least a fortnight the most polite comment usually went along the lines of " Sir, can you pass me the curse word, Please ?" after a few repetitions one got very tempted at times to ask which one?
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