Gallery, Projects and General > Neat Stuff
Mini surface grinder
Darren:
Point taken John, and understood.... :thumbup:
John Hill:
--- Quote from: Darren on July 31, 2009, 06:37:17 PM ---
--- Quote from: bogstandard on July 31, 2009, 05:24:27 PM ---
It works on the same sort of principle as your little shaper, but it grinds rather than cuts. Take a grind, move across a bit, do another one.
--- End quote ---
Talking of shapers, I was sitting looking at mine tonight thinking, what if....
What if you mounted a grinding spindle in place of the clapper box?
As you say, the shaper takes a cut, moves across a bit and takes another cut. You have an indexing device in the form of a slide.
I think that about covers it dunit....?
--- End quote ---
Persactly what I had in mind Darren, I even looked in the junk box and found a little spindle, must not get sidetracked, must not get sidetracked.
--- Quote from: Mr Bogstandard ---Unfortunately Darren, the surface grinder works on a little more precision than your shaper has got.
--- End quote ---
Eh what? Do not go casting nasturtions by association at Sally Shaper! :wack:
bogstandard:
John,
Would I do that to Sally?
But just to explain a little deeper.
For a surface grinder to do it's job correctly, you grind the table to the spindle. This is carried out every so often when the usually fairly soft top on the mag chuck gets damaged or worn, just to bring everything back into harmony. So fixed spindle, matching table.
You want to bolt the spindle onto a lump of metal that is pumping in and out with the running surfaces most probably made of metal to metal dovetails, or even worse.
You would only have to be a minute amount of a degree out on setup and if you took a very close up shot of the workpiece afterwards, it would most probably look like it was rows upon rows of sharks teeth.
The surface grinder works on the principle of that perfect alignment of spindle to table always being there.
Even Bernd with his rough spindled machine, with a terrible finish, would, I am sure, end up with a flatness you could only dream of Sally being able to do. We are not talking thous or tenths here, but undetectable with the measuring equipment we use.
John
Darren:
--- Quote from: bogstandard on August 01, 2009, 03:15:51 AM ---
For a surface grinder to do it's job correctly, you grind the table to the spindle. This is carried out every so often when the usually fairly soft top on the mag chuck gets damaged or worn, just to bring everything back into harmony. So fixed spindle, matching table.
--- End quote ---
I do that on the mill vice jaws. machine them true once it has been aligned and clamped down.
Can't get any squarer than that.... :dremel:
Pelallito:
John,
You posted the following-I use mine mainly to get perfectly ground lathe tools, when talking about your surface grinder. What kind of jig do you use to hold the tools and set up the correct angles? I found the concept of sharpening my cutting bits on the surface grinder, intriguing to say the least.
Thanks again.
Fred
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