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/diy/ Do-It-Yourself

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Anonymous 2014-10-15 04:25:42 No.711159

[Missing image file: ]

Anyone know anything about laser cutting?

I make these brackets by hand right now, and they're obviously imperfect. How much would it cost to have these laser cut to perfection?

Anonymous 2014-10-15 04:27:47 No.711160
You'd have to countersink them yourself, but if you're okay with some rather rough machine cut edges, they can make a shit ton of perfect triangles with holes in them. You could probably even have them just make starter holes and drill/ream/countersink them to your own perfection. Call up a local shop (or several) and see how much they charge. Also you could have them water jet too.

Anonymous 2014-10-15 04:31:58 No.711164

My plan exactly if I went this route. I don't mind drilling/sinkin' them myself as long as the starter holes are there. And believe me, I don't think I'll mind rough edges. Mine are super rough/sharp.

Unfortunatly there are no local shops, so I'll have to email a few out of town. Do you have any idea how much one bracket like this would cost? I imagine material cost + ... time? per inch?

Anonymous 2014-10-15 04:32:48 No.711165
nothing is perfect

everything has a tolerance

the question is what tolerance do you need and why

More than likely any part that you are measuring to the nearest 0.5" would be a waste of time, resources, and money to get be manufactured by a cnc laser cutter

The only time it would be worth getting something like that cnc'd would be if you were making hundreds

Former cnc operator

Anonymous 2014-10-15 04:40:57 No.711169

About 500/month

And yes, these imperfections, specifically them not being perfectly flat, is causing issues. But if it'll be $10 per bracket than clearly that would be way too much.

Anonymous 2014-10-15 04:50:11 No.711176
Also, as a side note... Is this welded? The person put some steel rods through a steel bar, and... either welded, or heated it up to fuse it? Doesn't seem like a weld cause there's no grinding

Anonymous 2014-10-15 04:51:12 No.711177

forgot pic

Anonymous 2014-10-15 04:52:43 No.711179
getting laser cut won't do anything for them being flat

that has to do the the sheet stock you use

unless you are just really bad with a saw and you aren't using cutting fluid

Also being sharp is completely up to you being negligent in deburing them with a file

Making 500 a month could be worth it to get the cnc'd, whether it be plasma, laser, water, or edm cut

If this were me and i had access to a proper band saw, i would clamp the sheet metal together until i had about 1" thick sheets of metal in precut 4" squares and cut them all at once. That way im making multiple triangles that are identical in one go.

why does the absence of grinding mean it couldn't have been welded? Im not following your logic. The picture is too small to see what's going on anyway.

Anonymous 2014-10-15 04:58:21 No.711183
you do realize if that is supposed to be a right triangle there is no way that hypotenuse is 6.5" long.

a right triangle with 4" legs would have a hypotenuse of 5.6" roughly . Unless those numbers are not supposed to be the dimensions of the triangle, then jsut forget everything i just said.

Anonymous 2014-10-15 04:59:28 No.711185

The sheet metal I get is completely flat. The problem is I'm using a metal shear, which is what bends them. Perhaps I'm using it incorrectly? I don't have a saw to cut them with.

I am new to all of this type of stuff. One month ago I had never touched a welder, or a drill press before, and everything so far is self taught.

As for the weld... That surface would have to be perfectly flat for its intended purpose.. and don't all welds leave a bead? I attach the rods to the bracket in the exact same way, but I have to grind the bead down flat. So, since there's no grind mark I am assuming they are heated it up to the point is fuses, if that's even possible. I just remember reading about that.

Thanks for the help & insight!

Anonymous 2014-10-15 05:02:02 No.711186

You are 100% correct. I sometimes measure at the 1" mark on the tape measure, and sometimes forget to subtract the inch. LOL... fuck

Anonymous 2014-10-15 05:02:07 No.711187
Yeah shears won't really leave a flat surface at all. As for the welding, perhaps it's only welded on one side? There's a tendency to want to keep your projects s00per seekrit OC DONUT STEEL, but /diy/ks are much more likely to give you good advice if we have more information about what you're trying to do/requirements of your project. Nobody knew why the hell your parts were going out of flat until you mentioned the shear.

Anonymous 2014-10-15 05:05:31 No.711191
If you are being employed as a welder and there is a grinder in your hand, then you are costing your company money. the only time a weld is every ground is if you messed up or because of design it needs to be flush with the original surface. Which should only be done unless its absolutely necessary.

It depends on your process. If you are GMAW, FCAW, or SMAW then yes there is always a bead. With GTAW you only have a bead if you use a filler rod (technically).

There is nothing you can do about it then if you are using a shear. That would not be my method of choice to fabricate these parts.

Anonymous 2014-10-15 05:12:32 No.711194

Here is the other side. Rod put through hole, and either welded/fused in the other side

Sorry for potato quality pic, best I could do


Not employed at all. This is me just eh.. DIYing, and learning along the way. The reason I grind, is cause, I put a steel rod through a hole, and have to attach it. It's damn near impossible (for me , using arc welder) to weld around the rod. So I just weld the other side and grind it.

Anonymous 2014-10-15 05:25:31 No.711197

I think you're right about GTAW (Tig right)? Looks like you can just fuse together without using filler material. Super cool, might get a TIG welder now

Anonymous 2014-10-15 05:28:17 No.711200
I dont think you need a laser for that simple design. looks like you need a shear and drill press.

Anonymous 2014-10-15 05:32:37 No.711203
Not to discourage you or anything (this IS /diy/) but TIG's the hardest to learn more or less.

Anonymous 2014-10-15 05:38:03 No.711206


Still gonna try it, no worries. Not too dangerous though right? Should I find a tutor?

Anonymous 2014-10-15 05:39:25 No.711208
Depends, if you're just dicking around or /diy/ing, maybe it's not worth it. I still don't really quite see/understand why you can't get away with your current welding setup or using a different method.

Anonymous 2014-10-15 05:44:01 No.711211

I can stick with my current method of welding. But I do think laser cutting is the way to go. I've been researching a bit and it seems everyone else has their brackets laser cut too. I got super discouraged cause their's were so perfect and mine were shit, but now I know why. Drafting an email to send to several cutting services to get some quotes.

As for tig welding.. it can't hurt to learn it. Just gotta save up to buy one.

Thanks everyone for the help! /diy/ hasn't failed me yet!

Anonymous 2014-10-15 06:06:25 No.711220
how about you jsut tell us what you are making ya dingus

Anonymous 2014-10-15 07:17:08 No.711238
Apparently a Center For Ants Who Can't Read Good.

Anonymous 2014-10-15 07:25:59 No.711243
Get a cheap desktop CNC of ebay
here's my blog on the subject. http://slavestoaramok.blogspot DAHT com/2014/05/desktop-cnc.html
I say a lot of bad stuff about CNC's like these but its just things to keep in mind. beats making them by hand ten fold.

Anonymous 2014-10-15 09:58:03 No.711292
What is a fucking single cut file and a square. Should be able to get within 0.001" if you're not retarded

Anonymous 2014-10-15 12:07:53 No.711308
I could cut them out on my cnc plasma cutter in about 30 seconds, and drill/countersink in about a minute.

I wouldn't charge anything if you came into my workshop and asked for something like that. Go look for some engineering places and ask, providing you don't need hundreds of them......

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