MK3 Disk Brake Machining / Grinding Queensland Australia
- Thread starter CHARGER
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Gidday All
Well if .250/.260 is the size limits, thats 10 thou off. so at a pinch Rohan's 14 thou would still be safe. So .246 minimum thickness it looks like. this is a comment, not a recommendation. From .260 max to .246 min, whats the reduction expressed as a percentage ?.
For the technically interested, Blanchard grinding refers to a rotary surface grinding process using a specific type of machine tool.. A blanchard grinder has a horizontal rotating round magnetic worktable , above which is mounted a vertical spindle segmented grinding wheel, mounted directly to the electric motor spindle. the grinding wheel moves in a vertical direction only. this leaves the characteristic "cross hatch" pattern. the finish is relativly coarse for a grinding process.
For applications requiring a far finer finish than can be obtained with the blanchard process, a machine known as a ring grinder is used. good toolrooms probably have a ring grinder. a ring grinder has the same horizontal magnetic rotating circular work table as a Blanchard machine, but the grinding wheel spindle is horizonal so the wheel it self runs vertically, exactly the same as surface grinder. the wheel moves verticall to set the depth of cut, and radially from the OD to the centre of the work table to traverse the face of the job. it is a slower process than Blanchard .
Both processes are eminently suitable for cast iron Norton discs. So is turning in the lathe. if having trouble with hard spots, chuck a CBN or ceramic tip in and go really fast as u can wth a finest feed and couple of thou cut. the finish is very very good.
the reason austenetic stainless cant be done easily by either process is these steels are non magnetic and the work table is a big electro magnet. if there is a reasonably magnetic grade being used, the job can be mounted just as a piece if steel.
The finish debate seems academic to me. A solution looking for a problem. it dont take long, a few thousand revs and the finish is gone or starting to go.
For your information best wishes Aussie bradley
Well if .250/.260 is the size limits, thats 10 thou off. so at a pinch Rohan's 14 thou would still be safe. So .246 minimum thickness it looks like. this is a comment, not a recommendation. From .260 max to .246 min, whats the reduction expressed as a percentage ?.
For the technically interested, Blanchard grinding refers to a rotary surface grinding process using a specific type of machine tool.. A blanchard grinder has a horizontal rotating round magnetic worktable , above which is mounted a vertical spindle segmented grinding wheel, mounted directly to the electric motor spindle. the grinding wheel moves in a vertical direction only. this leaves the characteristic "cross hatch" pattern. the finish is relativly coarse for a grinding process.
For applications requiring a far finer finish than can be obtained with the blanchard process, a machine known as a ring grinder is used. good toolrooms probably have a ring grinder. a ring grinder has the same horizontal magnetic rotating circular work table as a Blanchard machine, but the grinding wheel spindle is horizonal so the wheel it self runs vertically, exactly the same as surface grinder. the wheel moves verticall to set the depth of cut, and radially from the OD to the centre of the work table to traverse the face of the job. it is a slower process than Blanchard .
Both processes are eminently suitable for cast iron Norton discs. So is turning in the lathe. if having trouble with hard spots, chuck a CBN or ceramic tip in and go really fast as u can wth a finest feed and couple of thou cut. the finish is very very good.
the reason austenetic stainless cant be done easily by either process is these steels are non magnetic and the work table is a big electro magnet. if there is a reasonably magnetic grade being used, the job can be mounted just as a piece if steel.
The finish debate seems academic to me. A solution looking for a problem. it dont take long, a few thousand revs and the finish is gone or starting to go.
For your information best wishes Aussie bradley
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- Oct 19, 2005
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Theres a box to top area to tic on tagging delete post that takes it all away not just another edit page to explain. Btw has anyone determined how much meat can be removed before risking caliper pucks to push past bores? That is the real limiter to amount of grinding. I find it hard to believe surface texture and directions can't be detected on brake effort though can believe its not much better than just no chrome left.
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