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| Surface grinder concept/project |
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| BillTodd:
Quiet in here :poke: I purloined and few bits from a scrap wire-eroder that have inspired a couple of project ideas - (it was working and only scrapped because it needed to be moved and the only way to get it out of the workshop was in bits) From the U/V wire-angle mechanism I have an incredible two-axis slide unit - cross roller guides, 1mm pitch ball screws , preloading gears has to have been designed for micron precision or better . But more on this later... From the head unit I have a couple of Rexroth double row ball linear guides . These are far too good to use on the plasma cutter I had planned , hence this surface grinder idea. A while ago , on YouTube, Stefan Gateswinter' showed off his new Bema surface grinder (https://www.bemagmbh.de/en/range-of-services/lever-operated-flat-grinding-machine/) I liked the compact size and novel layout. I also had a pair of US made servo linear axes modules very much like the ones used on the Bema , I just needed something for the table to slide on. The design is a bolted aluminium construction , using 25mm plate for the base and 10-15mm plates to stiffen where required . The table will have a travel of about 11inches (280mm) with the head traversing 14" (350mm) or so. It should have about 12" (300mm) above the table . I'm not sure about spindle ATM. I have an old Black&Decker grinder spindle (yes I know B&D but it is from the days when they made a better class of tool) I'll probably use a chain driven table (Like Bema) but may motorise the Vertical and traverse since it will be easier than adding handles . If I can find a suitable head unit, the Z will have a 0.1um Mitutoyo scale also courtesy of the wirer :-) Coming soon ... microscope and/or Nano-mill :proj: |
| shipto:
I have been thinking recently about putting linear rails on my converted surface grinder. although I would put the rails upside down rather than the way. This way I figure there would be less chance for the grinding dust to sit on the rails and damage the bearings. I know you could cover them but I still feel there is the risk. I do like that design though. |
| BillTodd:
I'm sure it would work fine. The table is supporting the whole length of the rail so it operates like a mill where the bearing is directly under the cutting force I've gone for the stationary rail which keeps the table lighter and easier to traverse manually. The dust cover is a problem, I can only find flat bellows ( rather than the inverted U shape I would prefer), so I am thinking about light air pressure to reduce dust ingress , perhaps using a hoover motor as a pump. |
| BillTodd:
Update on the spindle assembly. Like the Bema model, the entire head can revolve . so to see what it would look like, I added a cup wheel the the rear of the spindle , it could be used in a horizontal vertical fashion a little like a Blanchard . |
| ltlvt:
I would love to get my hands on a Vintage Mini Surface grinder. But in my area if it gets machined it must be for an Oil Well. Nothing small around Oil Wells. |
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