This is really part 3 of the bowl turning postings and I have included it as an alternative to purchasing a slow speed bench grinder or a Tormek.
Now as you know the top of the range T8 with accessories can push you towards a thousand pounds and poor retired plumbers have short arms and long pockets.
Now I soon found out that turning chisels quickly lose their tip and dull quickly especially on hard woods. My existing grinder is an exceptional tool but it’s far too fast for grinding tools at 1400 rpm, and I found out to my cost that tool steel burns very quickly.
So, I decided to go down same route as my wood lathe and install a second inverter.
I bid on E Bay for a Teco E150 3ph to 3ph frequency inverter. Brand new, never out of the box. Went in at the starting bid of £60 and no other bidders. Mine for £62.50p including postage. Retail cost is about £500 inc vat.
I like a separate potentiometer, (speed control) again E Bay £60 with about £25 for connections, isolator and junction box from Screwfix.
As you will be aware chisels have a wide range of cutting angles, I therefore decided to alter my grinder platform which is usually set at 90 degrees to the wheel. I re-engineered the platform to make it adjustable to suit any angle and fitted a larger platform which is easily adjustable by use of a side lever.
I have fired it up and it surprisingly works just fine. I can now run the grinder between 0rpm up to 1400rpm without any loss of power.
I am now looking at getting some form of water retention incorporated, but as yet not sure how to achieve this. Might also change wheel for a finer one.
I am now confident with my new improved razor-sharp chisels I can now do more serious injuries to my digits.
I hope this post will give the forum an alternative to expensive methods available at retail level, and should anyone decide to go down this route please feel free to contact me for any further information or assistance, especially on the wiring.
Should you decide it’s for you please remember your inverter must have input related to your household supply i.e. 240v single phase or 415v 3ph and it must be equal or greater than the KW and HP of your motor.
Nice job Colin. The grey wheels tend to be too coarse and too hard a bond for sharpening chiselsand irons. Great for sharpening axes and lawn mower blades. I replaced one of mine with a Norton white stone with softer bond from Lee Valley. I think it is around 180 grit where the typical grinder stone is around 60. If I use common sense, patience, and a light touch I can avoid burning the edges when I sharpen. If.
Another option, the one I took, was to use an industrial sewing machine motor to power my four wheel grinder. The motor is a 3/4 horse, DC motor and controller. I can adjust it from zero to twenty-five hundred RPM. Thttps://www.routerforums.com/attachment.php?attachmentid=369227&stc=1&d=1557210059he slow speed, especially coupled with the CBN wheels, allows me to work my knives with minimal metal loss or heat build up.
Just a little add on to show off my first bowl which on first sight looks ok. I have sent it to my daughter Mandy in Bournemouth, who seems delighted with it. She will probably bring it out of the kitchen cupboard when she knows we are visiting. the aesthetic touch is the walnut inserts, which I told her were artistic license, but in reality I used too long screws on the chuck back plate which came though into the bowl and even managed to take the tip off the chisel as well.
She doesn't subscribe to this forum so think I'm all right.
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