The Shop > Tools
Tool Post Grinder
CrewCab:
--- Quote from: Darren on October 10, 2009, 02:39:56 PM --- .... confused meself now .. :doh:
--- End quote ---
and me :scratch:
:beer: CC
Darren:
Ok,
Wot I'm meaning is this, Stew can reverse the router motor direction because he's not using the routers collet which would come off in reverse direction as the threads would be the wrong handedness ..... I bet that don't help one iota :lol:
John Hill:
I think it is a good idea to have the sparks going down, less mess. One of my books says to put a tray of water arcross the ways which will catch almost all sparks and grit.
HENNEGANOL:
Why not do away with the spindle and use the router to hold your grind stone. The motor is rated at more than 1 HP and you are able to adjust the speed.
I have an old B&D router which I fit in a block of aluminium bolted to the crosslide. The aluminium block was bored out to suit the boss on the router, using a boring attachment mounted in the headstock spindle, which ensures that it is at centre height.
The collet on the router can accept a 1/4" spindle which means that Clarkson FC3 throwaway cutters can be fitted or suitable grindstones. The motor is rated at 480 watts and runs at 26,000 rpm, which I suspect is the light load speed.
Gerald
bogstandard:
Sorry to have addled your brains a bit lads.
I was refering to the lathe chuck not the router chuck.
The normal method is to have the two grind faces running with each other rather than against. So if the chuck was going in it's normal rotation (anti clockwise), for outside grinding, you would have the grinding wheel running clockwise.
Unless you can reverse toolpost grinder and of course the grinding wheel, then for internal grinding, you should run the chuck in reverse, to get the two faces running together the same way.
The reason for the difference in speeds between internal and external is because of the peripheral speeds of the wheels. Outside grinding uses a larger wheel, so the speed has to be kept lower to keep within the burst limit of the wheel. Inside grinding wheels (usually called a mounted points) are much smaller, so their burst speed is much higher, so are run a lot faster.
Hope I have got it all right.
Bogs
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