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| stefang:
Hi folks...the dull cutters in my shop are getting more and more, so a friend of mine convinced me to build the Bonelle grinder. For those, who don't know, the Bonelle is a modified version of the famous Quorn grinder, with no need for castings, as it is completely machined from bar stock. First, I redid all the drawings in a 3d Cad and converted it to metric. As the drawings were nearly finished, I could order some steel and start on the base: Cleaning up on the shaper: Drilling and milling on the cnc: Contouring the ends: Boring out the holes for the bars, those for the front bar are oversized by 2mm, as they will be filled with moglice, to form a perfect sliding fit. (Moglice is a product of the german manufacturer Diamant, which is special designed to cast/mold bearing surfaces, see here: http://www.moglice.com/ .) The bars are aligned in the baseparts with the help of gauge blocks and purpose made centering rings: Then the moglice is injected with a syringe throug a small hole previous drilled. After 24 hours, the bar can be removed, and what you get, is a high precision bearing: Here is a piece of cast iron cut to size for the front sliding base: ...and machined on the shaper: ..drilled, and bored, also oversize: Once again, casting the bearing surface with moglice, this is, what the final preparated workpiece looks like, the hot glue seals the centering discs against the workpiece, so no moglice can escape: Again, the bearing surface, it's a bit hard to photograph, in reallife it is absolute perfect and smooth: Progress so far: Machining the sheet metal parts for the sliding base: Mounted to the sliding base: And now, for the micrometer dial, I started with a piece of M.S. (Mystery Steel): A few hours later: Machining the tilting base: Put together: Here with the rotating base: In the picture, I am measuring the planar runout of the rotating base, which is well below 1/100mm (its a 1/1000mm dial indicator) Overview: Then I went on for the rocking arm (Sorry, no machining pictures here...) And finaly here is the motor, which will drive the grinding spindle. Its a Perske 3phase highspeed motor, which is ratet up to 23000rpm and is powered by a Siemens frequency converter. Will keep you updatet...as long as i dont bore you :D greetings Stefan |
| ieezitin:
Stefan I have never herd of moglice, wow what a product, thank you so much for introducing this product to me. May I also comment on the great use of the shaper in this project, sadly it’s a shame this wonderful machine tool is not used so much anymore and or people who know how to run it, and may I compliment you on such a nice bit of kit and machinery through out your shop, whats the makers name of the shaper?. I commend you on such an interesting build, be sure I will be watching. Anthony May I add that the use of the stick rule has fallen by the way too. To me its apart of my body my wife always complains it sits on my side of the bed. |
| cidrontmg:
Oh boy... That´s just lovely. The Gack doing nice chips! Would that friend perhaps be Mr. Joachim Steinke (http://www.metallmodellbau.de/)? He also did a (modified) splendid Bonelle t/c grinder. I have my fair share of dull cutters. I´ve been contemplating about a t/c grinder (buying, doing, not stealing though...), and come to the conclusion that I´ll just keep on buying new ones, and throw the dull ones away, with a bleeding heart... :bang: :bang: :bang: I´ll be following this with both eyes wide open. :wave: |
| Rob.Wilson:
Great stuff Stefang :clap: :clap: :clap: :clap: I have the Bonelle TCG plans ,,,, one day i may make a start on it ,,, will be good to see how you go about building it :thumbup: Rob |
| doubleboost:
Real quality work :D :D :D :D :D Keep the posts coming John |
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