While I was doing a vise recently, I noticed that my cutting line was not straight. After putting two elements together, it turned out that there was a gap and then they had to be filled with a weld. So without thinking long, I decided that as soon as I finished the vice, I would start building a metal cutter.
As the budget for this project was quite limited, instead of combining with an engine, septic tanks and belts, I decided to use an angle grinder, which was used once a year anyway. The grinder mounting was made of three pieces of a flat bar in which I drilled holes for the mounting screws. If necessary, the grinder can be dismantled by unscrewing three screws. The arm is a rectangular profile with a 20mm diameter shaft, placed in two self-aligning bearings.
The top and legs are made of 30mm profiles.
The support of the cut element is an angle that I carved for half a day to get a given shape.
The clamp is a piece of the profile shot through with a screw which was also shot with a piece of threaded rod.
In order for the grinder not to fall, I used a gas cylinder found on the scrap metal.
As for the costs, they are negligible. Scrap profiles and flat bars PLN 1.50 per kilogram. I had a 20mm shaft at home. The self-aligning bearings lay in the shed. So adding everything up did not exceed PLN 50.
To sum up, the project was successful and it meets my requirements, such as cutting at an angle of 90 and 45 degrees, which can be seen in the attached construction video. I'm waiting for opinions.
So similar to such a device bought in a store. In addition, a whole day of work, so twice as much. I also wanted to build something like that, but after thinking it over, I found it a waste of money and I'd rather buy it ready. On the other hand, your structure is probably much more solid and with less play.
I refused to buy a welder for several years and I must be honest that those were lost years.
I have the same thing with each subsequent larger tool, a migomat, a table drill, a plasma cutter, a milling machine, a 3d printer. If a man had enough space and money, he would have built a workshop larger than a house :D
I would add a laser sight, it makes it much easier to precisely set the detail. Now you probably need to take the grinder down and aim the shield at the mount. Instead of legs, for ease of use, I would simply drill the frame, underneath it thick rubber pads (old tires, rugs) and the whole thing screwed directly to the table through these holes. Well, unless the disc is greater than the thickness of the rubber and the frame, then the legs will actually be useful, or a hole in the table.
Now that you've mastered the construction of the vice, you should do more with this project. It's something with a handle - it doesn't look very solid (jaws) ... How much lateral play do you have on the grinder? It would be useful to think about fixing this structure to the countertop. With longer and heavier profiles cut, it can be a nice ride * ...
The actuator looks out of order because in some shots it looks as if the grinder was pulled downwards there. And the digital protractor ... I meant one with numbers I got it wrong, it's just about being able to set the angle just like that, not on a digital measurement screen - although on the other hand with some arduino or esp it can be cheap and simple ...
When the grinder is lowered, the actuator is almost parallel to the arm and therefore does not raise it up. This is useful when positioning the blade where the line of the marked cut is. As for the angles, you can not see it in the video, but I have 45 and 90 degrees marked so the setting takes less than a minute.
A git machine as it used to be called. I built a much larger one with a belt drive, it did the job, but it was a huge rotation angle of the cut, I would have a cut under the arm, which made it easier to cut long profiles, but the machine, because one big job was put away, because it took up valuable space. now I'm trying to build a small one like yours. It's actually your merit. You motivated me ? Is the arm not too big peoples?
If you just take my word for it, I'll tell you that there is no slack. It doesn't even twitch to the side, thanks to the bearings in the housing. However, I noticed that I have a slight play in the grinding wheel and I will have to replace the bearings in it.