/diy/ - Do It Yourself

>>1516257

mark it clearly (one of those soapstone markers or something ), wear a faceshield and see the cut clearly. as you hold the grinder rest your hands on the steel as you move.

or use that other hole for the handle and make something that can ride on a piece of angle iron or whatever guide clamped to the steel

>>1516257
Id use one of those hanheld bandsaws instead.

use a guide

Try an angle grinder stand

>>1516268
This, clamp a piece of thick straight metal on and cut alongside it. Easy and works well.

>>1516257
>How to ___ ___ lines in ___ using ___?

The answer is always, "Buy or make a jig or guide specifically for the job."

>>1516257
Use a cutoff wheel (and face shield) mark out your lines with a sharpie, and take your time.

If that is too hard get a hold of a portaband.

If possible practice some cuts and skip the caffeine so you shake a little less and maybe have a beer or two.

>>1516283
this is what I do too. clamp a sacrificial bar along where I want to cut, and clean it up straight every so often.

take to a metal shop and have it stomp sheared

>>1516275
please tell me you're not really this retarded.
>>1516257
op, it's pretty easy, just mark your lines clearly and go for it. angle grinders want to cut straight lines so it's not hard just take your time.

>>1516257
Since you don’t have access to a punch press Harbor freight has some kind of guard with a guide on it. Use some clamps and a straight edge I guess.

>>1516317
>clamp a sacrificial bar
if you set it up properly you can run the guide bit that stops sparks and exploding disc fragments from hitting your eyes along a fence/bar/thing and so not damage it and it is no longer sacrificial.

>>1516268
This. Don't overthink it.

>>1516257
American here.
That's like the size of a piece of paper, right?
Just use scissors?

>>1516257
a metal cutting blade on a skilsaw/table saw?

use something as a guide if you want to use the grinder?

Draw two lines with a positive and negetive tolerance and grind the rest flat

>>1516968
To elaborate for OP, draw a line that forms the straight edge you want. Use a heat-tolerant marker like a black Sharpie or even better an industrial paint marker. If your shop lighting is good, a soapstone could work. In any case, cut far enough outside that line so that you can clearly see it after the cut. Then grind down the edge precisely to the line. A flat disk would be good for that task.

>>1517095
is that like 10 grit?

>>1517095
>>1516262
I’ve done what you’re trying many times op. I use both of these. Definitely use a thick plate or some angle iron as a guide across the line. Final touch ups with a pad to smooth the cut out.

Do you have materials to make a jig? Even wood will do.

>>1516257

>Any tip how to cut long straight lines?

this is what i do on a daily basis at work

>take a drawing needle
>measure and mark the thing
>take a metal ruler/winkl
>draw a straight line
>draw the same line a few more times so its clearly visible
>put on safety galses/goggles
>start cutting exactly alongside the line, not on the line, but precisely alongside it(remember which side of the line you need to cut, preferably before you start cutting)
>if the cut is long draw another line using the thickness of the cut(3mm is standard), so you can see where youre going on both sides of cutting plate
>relax and focus
>start by holding the tool straight in front of yourself and proceed to cut
>move so as to hold the tool alongside yourself and using the starting cut as a lead proceed to cut the whole thing(leave a tiny bit if the piece is extra large or heavy)
>remember to maintain the angle or the thing will jump and kick like crazy
>stop to draw the line again cause its not visible enough
>curse god and family as you fuck up in various ways and periodicaly get particles of burning metal in your eyes regardless of protection
>pay attention to how the cut piece falls, this can squese the cutting plate which can be dangerous depending on size and weight as well as fuck up the tool or cause the plate to break or explode in your face
>grab the piece and cut the final bit from the opposite direction or break it off by twisting repeatedly in different directions/ just cut it straight off if its a smaller/lighter piece
>grind off the little flaky bits
>smooth out any obvious irregularities
>decide not to worry about it and proceed to repeat the procedure on the next piece

this is seriously the fastest and simplest way, it just takes you a couple of weeks to develop the skill

also, if using a small grinder its best to remove the handle, and use a large grinder to cut anything whenever possible, its way more precise and faster

>>1517138
>it just takes you a couple of weeks to develop the skill
OP supposedly has jazz hands, so a technique that relies on precise manual control may not work very well.

Two clamps. A straight edge. Offset it by the width of the grinder shield. As long as you are hard to the grinder you will get a straight line, what I do when I'm building with skill saws.

>>1516257

why not just say 1m square, why say 1000mm. that's like if everyone in the US used sixteenths of an inch to describe lengths.

>it's 3000 sixteenths of an inch long m8