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| Bonelle T&C Grinder |
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| stefang:
Thanks for your comments, I will keep the pictures coming :) --- Quote ---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. --- End quote --- The Gack is an awesome piece of machinery, I love it. I know and adore Joachims work, it is just perfect, but the person, who convinced me, was JimmyBondi (He has pictures of his Bonelle over there at HMEM) --- Quote ---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 --- End quote --- Yeah its sad, that this sort of machine is dying...replaced by CNC and EDM Machines..but they are a great value for the home engineer, as the tool costs are almost zero...AND the shaper is a wonderfull machine to watch..almost hypnotic. --- Quote ---whats the makers name of the shaper?. --- End quote --- Its a German made Gack HE-20, there is somewhere a Thread here on MadModder relating to it. --- Quote ---one day i may make a start on it --- End quote --- Go for it, Rob, it will last long enough :D Todays (and yesterdays and before yesterdays..) work: Beginning with the toolhead: Machining a piece of cast iron to size: The toolholder is hidden somewhere in this block of cast iron.. :scratch: After a bit more shaping, boring and milling, the bearings were again cast with moglice, here a shot, short before injecting the moglice. The hotglue holds the centering discs in place and seals everything up (The moglice will go everywhere, if not done..) My way of adjusting the "master"-shaft before casting: After casting, a bit more shaping with the shaper.. :) ...and profiling with the milling machine: The almost finished toolholder, test fit: greetings Stefan |
| Trion:
Very impressive build you have there, not to mention the über neat shaper! :clap: May I ask where one can buy Moglice? |
| arnoldb:
Excellent work Stefan :bow: Thank you very much for showing; a T&C grinder is pretty high on my to-build priority list, and I'll be following along closely :) I really like that Moglice stuff as well... Is it relatively expensive & can it be used to replace Babbit bearings ? Their site does not seem to give too much information - or I'm too uninformed to understand it :doh: Kind regards, Arnold |
| kvom:
This is a very interesting project, and as well interesting as to the use of Moglice. I think a couple of points could be added about it: 1) The accuracy/smoothness of the bearing is only as good as the shaft used to mold it. 2) The shaft is coated with a releasing agent so that the Moglice doesn't stick to it. I am wondering how durable the bearing surface is, i.e., could it stand up to steam engine crankshafts? |
| stefang:
--- Quote ---1) The accuracy/smoothness of the bearing is only as good as the shaft used to mold it. 2) The shaft is coated with a releasing agent so that the Moglice doesn't stick to it. I am wondering how durable the bearing surface is, i.e., could it stand up to steam engine crankshafts? --- End quote --- 1 & 2: Full Acknowledge, but even with the releasing agent (A alkohol solved wax), it takes some force to release the parts, but when you have washed away the releasing wax, the parts move freely. For the crankshaft, I don't know...this stuff comes out of the world of big machines, and I belive it is better used for slow rotating parts, other than small, fast moving, but, maybe I will try it out one day :) --- Quote ---Is it relatively expensive & can it be used to replace Babbit bearings ? --- End quote --- 50gramms (42g resin and 8g hardener) cost 11eur here in Germany. For the replace of babbit bearings, you have to ask the diamant people, they will tell you, whats possible. And now, for the bonelle grinder, more pictures: Slitting the collet, that holds the dividing disk on the tool holder spindle: Machining the dividing disk: The postman hates me ::) http://gtwr.de/bonelle_58.jpg Hot rolled steel for the upright slide. Machined on the shaper, then bored out with a rough surface, to give the moglice a firm grip: Slide with moglice applied: Master shaft, thats molded is positioned by the slip gauges, the hot glue (and two aluminum rings) seals the end Overall view: The scale on the vertical axis: Stefan |
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