Thread: New 72x2 Grinder WIP in Aus.

another box of bits arrived today


drive wheel & small wheel mount with a 2", 1" & 1/2" wheel

The Ali was al nice & clean & shiny until I got my grubby mits on them LOL.
great looking workmanship only a pitty that the drive wheel is not the 24mm bore ordered
so awaiting sellers response oh well a bit longer wait again LOL
still another couple of weeks of so before the Sunray contact & tracking wheels will be even made, so no time lost.

some more progress with a bit of hand sanding to final fit, the drive wheel is fitted to the motor
so now I have real dimensions for final design of the mounting plates etc

Only 5 days to get the right wheel to you. Not bad service.

No replacement required mate,
just had to do some minor sanding on the bore & shaft to remove some burrs creating misleading dimensions of a 4 thou discrepancy & all came up to spec
I had a local machine shop available to skim it if it was needed, to save the return trip but.

Steel marked out ready, ready for drilling & cutting
but now on hold as I just found out I am going to Mt Isa (Google that bucket of Joy if you want just enter Bum Fv<k nowhere Queensland, it will probably come up with pics) for the next week or 2 to do a Tender for work,
so apparently my real life is on hold, love the notice I get here LOL

Really enjoying your process Mate ....I'll be interested in the final costing too !!

Originally Posted by bluesman7

The grinder I made is not VFD. My belt speeds are approximately 425, 850, 1700, surface feet per minute. I started doing finish work at 425, but now I rarely go that slow. I'm glad to have the option though. 1700 is adequate for roughing IMO. I could definitely go faster for roughing, but I doubt I'll ever change anything to go faster. All I would need is a bigger drive wheel.

Well, times change. As my grinding skills have improved I don't see myself ever using that lowest speed and I decided that a higher roughing speed would be better, so I have a larger drive wheel coming in today's mail. The small drive wheel will live in the box with my contact wheels so I can just change back if I ever want that slow speed for anything.

New speeds will be approximately 850, 1700, and 3400 SFPM

Originally Posted by bluesman7

Well, times change. As my grinding skills have improved I don't see myself ever using that lowest speed and I decided that a higher roughing speed would be better, so I have a larger drive wheel coming in today's mail. The small drive wheel will live in the box with my contact wheels so I can just change back if I ever want that slow speed for anything.

New speeds will be approximately 850, 1700, and 3400 SFPM

Out of curiosity: do you think that a VFD would save you time?

Originally Posted by Bruno

Out of curiosity: do you think that a VFD would save you time?

I don't think more than a minute per razor. I do all of my rough grinding at one speed, and all of my post HT grinding at another. It takes less than a minute to move the belt to a different set of pulleys. I would only be changing the drive wheel for something out of the ordinary, and even then it would not take very long.

I've got similar thoughts for my new grinder, but going with the little buddy style of pullout flat platen (with 2" wheels). For hollow (at this stage) I can get an 8" wheel for $30. Not designed for this application but saw someone using it on facebook. Cast metal construction with urathane 'tyre', grease point, and rated to 350kg of load. I do like the idea of the small wheel mount, they are genius for small radii, and using them on a radiusmaster has proved their worth. I've also gone with a 2800 rpm motor and locally sourced VFD (both from WEG).

Looks like a good build so far.