Tuning a 78 knock-off

Re: Tuning a 78 knock-off

David Miller from Iowa

>Three potential causes:

#1 - The cutter was not factory ground square to the sides

#2 - The cutter slot is hitting the side of the bolt, preventing it from seating properly.

#3 - The slot where the side of the cutter touches the body is not right or there is a casting flaw, blob of paint or gunk in there.

For #1, regrind the cutter

For #2, file the slot or regrind the cutter

For #3, try to file it clear, but may have to settle for regrinding the cutter.

Notwithstanding, I expect it can be made servicable and $4 isn't bad.

Good luck, David

Re: Tuning a 78 knock-off

Gerry Doll

>Dave,

Thanks. I had not even checked the cutter slot. Another example of why I look for answers here.

Gerry

Re: Tuning a 78 knock-off

paul womack

>Problem is cannot seem to get the blade square to the right side without skewing,

The side faces of the blade should not be cutting; check the angle of the edge of the blade w.r.t. the side, and adjust the blade within the plane body.

You MUST not have an obtuse angle between the edge and the side. 90 is optimal, and slight taper is not a problem.

But (as posted elsewhere) review the bedding and mouth also. A little checking and measurement before removing metal is always wise. In particular, a (slightly) skewed bed neccessitates a compensating angle in the blade.

BugBear