In message , Phil Addison
writes
I acquired an oldish Bosch PHO 100 planer and having cleaned it up I'm
trying to adjust the blades. It seems very hit and miss on this machine.

The blades (755), see exploded diagram
http://www.mtmc.co.uk/Product.aspx?P...earch&PPGR =0,
are held by a flat slotted plate (51) that is held by 2 Allen screws.
After adjusting, these 2 screws are covered by a further curved
retaining plate (52) that is held by 3 more Allen screws, so there will
be 5 altogether clamping on the first flat plate. The bladed have
grooves in them that locate them in a fixed radial position against the
flat plate. They can be slid out sideways from the plate once the curved
cover is removed.

I have an ancient Wolf planer which is supplied with a sharpening jig
and a blade adjustment/depth of cut device. I can't see from the diagram
if your blades are mounted in a similar fashion.

On the Wolf, the blades are secured to a *mount* which has a 90deg.
flange: fitting tightly to a slot in the rotor. The whole assembly then
clamped to the rotor with a further set of screws.

Having sharpened the blade, it is then loosely assembled in the *mount*
and then adjusted for cut. The adjustment jig has a slot similar to the
rotor and a 90deg. reference face which the blade edge should just
touch. Clamp screws tight and reassemble to the rotor.

I suppose an *L* made up in hard plastic might do but perhaps a proper
jig is available from Bosch?

regards

--
Tim Lamb