Thread: The Generosity of Michael G

A number of us have been recipients of Michael's generosity and in typical fashion Michael asked me if I would like the spare pairs of boring bars for my boring head that he had carved from a slab of EN25.

I said yes and here they are. Left and right handed.

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Michael and I shared quite an adventure when we acquired and subsequently dismantled our Kaiser Piccolo boring heads roughly five years ago. Michael's came with nearly a full set of accessories, mine none. Michael's gift brings me closer to having those accessories that I thought I would never lay eyes on.

Thank you Michael.

Wasn't much Bob - the effort to make 2 sets was not very different to the effort for one.

For those wondering about the 'left and right handed', the Kaisers can not only bore holes but also round spigots (as pretty much all boring heads can). However, the tool holders have the hole for the HSS offset sightly so the cutting face is radially in line with the axis of rotation. I have not noticed this geometry on the Wohlhaupter, so this could be a Kaiser thing. Use a boring one for a spigot and you change the rake angles significantly and for small diameters, if your tool has not got extra clearance on the back, snapping the tool holder (as I did ). If you do have the extra clearance, then the HSS cutting edge will be much weaker. Hence the need for two types.

I suspect the next step could well be the PA treatment...
Incidently Bob, if you take out the SHCS that is used as a slide lock, put it in a battery drill and then make judicious use of a linishing belt, you can reduce the diameter just a smidge so that it will sit in the recess on the boring head. I discovered that it does not need much and looks neater.

Michael

Originally Posted by Michael G

.....

Incidently Bob, if you take out the SHCS that is used as a slide lock, put it in a battery drill and then make judicious use of a linishing belt, you can reduce the diameter just a smidge so that it will sit in the recess on the boring head. I discovered that it does not need much and looks neater.

Michael

Michael,

My Kaiser is probably older than yours as there is no recess below the slide lock cap screw. Now I have to find some other justification for buying a cordless drill!!

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Bob.

Originally Posted by Michael G

Wasn't much Bob - the effort to make 2 sets was not very different to the effort for one.

For those wondering about the 'left and right handed', the Kaisers can not only bore holes but also round spigots (as pretty much all boring heads can). However, the tool holders have the hole for the HSS offset sightly so the cutting face is radially in line with the axis of rotation. I have not noticed this geometry on the Wohlhaupter, so this could be a Kaiser thing. Use a boring one for a spigot and you change the rake angles significantly and for small diameters, if your tool has not got extra clearance on the back, snapping the tool holder (as I did ). If you do have the extra clearance, then the HSS cutting edge will be much weaker. Hence the need for two types.

I suspect the next step could well be the PA treatment...

Incidently Bob, if you take out the SHCS that is used as a slide lock, put it in a battery drill and then make judicious use of a linishing belt, you can reduce the diameter just a smidge so that it will sit in the recess on the boring head. I discovered that it does not need much and looks neater.

Michael

So PA'd they are. I thought it only appropriate that the little square block tool holders I made should also receive the phosphoric acid treatment.


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Michael obtained prices for some of the Piccolo accessories from BIG Kaiser in 2016 -

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The 416.121 is the short left hand boring bar. 153.40 Swiss Francs is today roughly $223 AU. DIY isn't a bad option at times!

Bob.