CUT STEEL WITH ANY MITER SAW - MODIFIED SPEED CONTROL SAW

I been wanting a steel chop saw or band saw for my garage, but didn't want to pay the full price for one. I have used abrasive chop saws before but was not impressed on the accuracy of the cuts especially when doing angles. And bands saws go for about $300 and above. So I decide to modify a Ryobi 7 1/4 in miter saw since I occasionally do metal work as a DIYer and wanted to keep it wallet friendly.  The total cost for this was approximately $100, $50 for the Ryobi miter saw, which I bought used on Facebook Marketplace, but didn't realize it was missing the clamping mechanism. I took the speed controller from my old broken random orbital sander for this project. I also tested the speed controller, on my Rigid 12in miter saw originally and it worked perfectly fine.

Speed Controller Makita model:BO5041 Controller: part number 631955-4 Price $19.14 https://www.ereplacementparts.com/con...

Steel used for this project:
1.5in x 1.5in x 1/8in thick angle iron

1.5in x 2in x 1/8in thick rectangle stock

Ryobi Miter saw TS1143L 5800 r/min (RPM) 7 1/4 saw(184mm) Purchased used on Facebook marketplace for $50

Diablo 7-1/4 in. x 48-TPI Cermet Steel Demon Ferrous Metal Cutting Saw Blade Max RPM 5800
https://amzn.to/3qhlKsj

Diablo D1260CF 12-inch Steel Demon 60T
https://amzn.to/2LKZE28

Freud-Diablo 6 in CARB TIP Metal RECIP 3 PK
https://amzn.to/3pgbP4R