I've seen several people having to shim their jointer when setting it up, but I
don't know what this means. I think most of the comments were in regard to a
model with table extensions, specifically the Sunhill 6" jointer. What is
shimming, why is it necessary, how is it done, and is it difficult?
This refers to placing shims between the mating surfaces of the central
casting of the jointer (the part that houses the cutterhead) and the infeed or
outfeed tables. This is done to correct misalignments (e.g. a sagging table)
or to remove play in the adjusting mechanisms. It's done by loosening the
adjustment far enough to allow placement of a thin piece of metal in the
appropriate spot in between the mating surfaces. How thin, and what is the
"appropriate spot", depend on the problem that needs to be corrected. Is is
difficult? Dunno. My jointer was good enough right out of the box that it
didn't need any shimming. Looks to me like the hardest part is figuring out
how much to shim, and where: likely a lenghty trial-and-error process, not
difficult but a PITA.
Doug Miller (alphageek at milmac dot com)
How come we choose from just two people to run for president and 50 for Miss America?
Shimming is a method of adjusting the alinement of attached things
(like table saw wings, jointer tables/etc) where one inserts thin
metal into the mounts to adjust the alinement beyond what is possible
with the standard adjustment methods
You can buy shim stock in thin sizes, and many folks make shim
material from things like softdrink cans/etc
On 26 Jan 2004 16:32:29 GMT, email@example.comAntiSpam (NoNameAtAll)
A very good jointer tune-up article posted by David F. Eisan a few years ago
explains how to check for alignment of the infeed and outfeed tables.
Basically it amounts to setting a straight edge across both tables in
various spots including the diagonals and poking around with a .007" feeler
guage to see if there are any voids. Then it is a matter of following the
manufacturer's instructions which will most likely involve fooling with the
gib screws. If all else fails with attempting to bring them in line, then
you may have to go the shim route. The article says to use automotive
feeler guages and start incrementally inserting them in the dovetail
race-ways of the outfeed table (you are moving the infeed table alot and
shimming there would probably not last long) until the tables come into
alignment, then break them off leaving them in place. Since "sagging" is
the usual culprit, it makes sense that you would be shimming the bottom
part. We aren't talking about much here...he suggests starting with .001
and working up from there. With geometry you can kind of figure out that
.001 at the shimming point can fix a much bigger gap at the cutter head.
My Delta 6" was doing well until recently. Yesterday I put new knives on it
and went through the entire set-up procedure with both the Delta
instructions and David's guide in front of me. I really flunked the "gap
test" heading towards the cutter on the infeed side but by simply loosening
up the gibs on the outfeed and resetting the table to the .06 above the
cutter head assemby, everything came into line perfectly, to the point where
a .003 feeler won't go anywhere. BTW, I don't have a fancy straight edge but
my 4' drywall T-square on edge worked just great and I confirmed its results
with a fairly new 4' aluminum level.
In my case I think the gibs were too tight and adjustments to the outfeed
table, as infrequent as they occur, were forcing it out of line, like maybe
the top one was holding firm but the bottom one wasn't (or the otherway
around). In any event I think I have dodged the "shims" for now.
If anyone reading this wants David's article, I'll be happy to send it via
E-mail. It is really quite good. Just drop "the -remove to reply-" part if
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.