|Forum topic by jcwalleye||posted 01-11-2013 04:39 AM||685 views||0 times favorited||2 replies|
01-11-2013 04:39 AM
I just assembled a new benchtop mortiser and was wondering how tight of tolerances it should be machined to. It’s a low end model, but not the lowest and I plan to write a full review when I get some issues worked out.
Basically the machining is not of the highest precision. First, the fence was not square to the base by about .007”. The chisels were also not square by about the same amount. I shimmed both of those to within a couple of thousandths, using a couple plys of beer can aluminum between the base and one edge of the column.
A little more serious problem is that the face of the fence is not very flat, wavering about .010” or one one hundreth of an inch at the biggest gap of the length. I don’t see any way to eliminate that short of having that surface re-machined.
Is that an acceptable amount or is it something to be concerned about. It doesn’t cut the cleanest of mortises, but some of that is to be expected from lower end equipment. And the chisels aren’t the highest quality and will benefit from some honing, which I plan to do next.
Thanks for your opinions.
-- Trees, a wonderful gift --Joe--