Power tool mod. you do and use at your own risk.
|Jim Smith 8||16/07/2021 13:19:41|
|29 forum posts|
I bought a cheap Einhell TC SM2531 mitre saw. for £129 it's pretty substantial with a 1900 Watt motor taking a 10" 254mm x 30mm x 3mm tct saw blade. I didn't use their stand and mounted mine to a tressle. I already use a Chinese 41/2" variable speed angle grinder mounted in a chop stand for cutting small steel section and rough facing.
After using the Einhell beast on some wood projects, it sat in my workshop doing nothing else. I often want to make a vertical cut in steel bar, or angle up to 50mm and a metal cutting chop saw would take up even more space so I looked at modifying the wood chop saw to take thin angle grinder cut off discs, which I use a lot for cutting small section stainless. I've even done rough profiling as I don't have a mill and stainless is easier to grind than machine.
The saw takes a 254mm dia tct blades with a 30mm dia arbor hole and the motor rpm off load is 4800 rpm. 9 inch 2mm thick stainless angle grinder discs are 230mm dia. with a 22.2 - 22.4mm arbor hole. A less common 10 inch thin steel cutoff disc and larger have a 25.4 mm arbor hole size but these tend to be only sourceable from China. Wood saws and blades are deliberately made to be incompatible with angle grinders! Recommended maximum spindle speeds are 6600 rpm for a 230mm disc and 6600rpm for a 250mm disc.
I ordered two replacement Einhell inner flanges (cheap @ 4.02 Eu but expensive Brexit shipping!). I ground two flats on a length of M16 threaded rod, put a hex nut on it and got some lathe practice taking off the nut flats and turning one nut down to 22.2mm. Using an M16 nut as a back nut, I fitted the Einhell inner flange held on by the turned down nut and put my home made arbor in the lathe. I was surprised how well their inner flange had centred.
Their flange steel is quite hard and could be stainless? It needs a TCT lathe tool to work it. On one flange I turned down their 30mm raised section to 25.4, and the second to 22.4. These discs are 2mm thick so I had to take about 1mm off the face of each flange to ensure their clamp washer would still fit over the flats of the motor spindle. There is plenty of metal to play with.
I mounted the discs and checked the disc runout in the saw. It's not as good as a lathe chuck, but better than my angle grinder.
These wood saws come with a reasonable ali frame and upstand, but pretty pathetic work hold down clamps and that's something I will have to think about for holding metal. The thicker disc sits slightly off center in their slot. Changing the blade and flange for a disc and modified flange is easy.
This is very much 'off the wall' and you should take all necessary safety precautions and use slow feed rates when chopping.
Edited By Jim Smith 8 on 16/07/2021 13:21:22
Edited By Jim Smith 8 on 16/07/2021 13:24:47
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