Gallery, Projects and General > The Design Shop
Portable milling/grinding machine for machine way reconditioning
PekkaNF:
Flat surfaces and there would be no problem with deep groove ball bearings. Or even with bench grinder that was suggested before and I did consider it.
However: I have dove tails to grind too and they probably will not be done in one go. Another sightly problematic surface is back of the vertical. only way I can imagine reasonable size grinding wheel there is a cup/face type wheel in reverse. I.E. I might need radial and axial loading in both ways. I tried to resist the latest one, because othervice I could have got away with two opposing angular contact bearings, tail one spring loaded. Pretty much same than Quorn type grinder, GREAT BOOK BTW.
http://s164.photobucket.com/user/rtgeorge_album/media/broadley.gif.html
Pekka
RotarySMP:
A couple of years ago I picked up a Fischer Precise FAV 80L grinding spindle off Ebay.de pretty cheap. there are a few options on Kleinanzeign.ebay.de (Craigslist in Germany) if you are interested:
https://www.ebay-kleinanzeigen.de/s-anzeige/schleifspindel/413146499-84-13826
My Fischer looks similar to this one (€70 for a new spindle! - you couldn't even get the bearing for that price)
https://www.ebay-kleinanzeigen.de/s-anzeige/schleifspindel/225839568-298-4254
Mark
PekkaNF:
--- Quote from: RotarySMP on June 01, 2016, 09:58:56 AM ---A couple of years ago I picked up a Fischer Precise FAV 80L grinding spindle off Ebay.de pretty cheap. there are a few options on Kleinanzeign.ebay.de (Craigslist in Germany) if you are interested:
https://www.ebay-kleinanzeigen.de/s-anzeige/schleifspindel/413146499-84-13826
My Fischer looks similar to this one (€70 for a new spindle! - you couldn't even get the bearing for that price)
https://www.ebay-kleinanzeigen.de/s-anzeige/schleifspindel/225839568-298-4254
Mark
--- End quote ---
Those are nice. Last one looks about right, speed is ok, physically is's tad too big. But price is right.
Trawled net and found some new (to me) info post #87 plus much of that thead is interesting.
http://www.practicalmachinist.com/vb/general/making-very-good-bearing-fits-2-3-microns-lapping-281292/index5.html
Pekka
hanermo:
I may be of interest that I am "hanermo" and the spindles are my project.
The spindles are not done, but the VMC is getting there...
Painted the last major assys last week, 2 vertical assy that support the bridge (== 700kg).
And the lathe is now running with C axis..
Need the lathe, to do the spindle mount for the VMC to do the flats for grinder, to make manufacturing spindles fast and easy...
PekkaNF:
Went on swap meet this week-end. There was a guy with spindles, but they were massive. Mainly used in wood working machines ISO40 and one 1/3 of that but something like 30 mm bearing shaft and the AC-bearings were shot.
I have two open issues:
1: Grinding wheel type/spesification? I never have used grinding wheel to cast iron, but talked to few guys who did a little and lit looks like aluminium oxide abrasive (White....) and fairly coarse like 46 and bit open/friable would be worth of trying. looks like I have to settle on normal disc type wheel, dress it somewhat slant to negotiate around dovetails and that must do.
I could buy russian boron nitride small sharpening wheels, but they are cup or saucer type. Problem is that they are very fine, mostly 80-100, very few #60. Would that work "kissing" on cast iron?
2: I'm considering gluing the fixed front bearing on bearing housing. It is one part bearing (no adjustable preload). It would make nose of the spindle whole lot more easy and more compact.
I checked some ready made spindles and they are great for something a little larger. I'm in a hunt of something like dumore tool post grinder size.
Last weekend went on my daughte's graduation (primary->seconday) and showeling/wheel barrowing few tons of gravel around my front yard....no swarf was being produced, but looks like I have all the necessary steel to make spindle looking object.
Pekka
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