Page -3-
Copyright 2013 ShopBot Tools, Inc
Press-fit jigs
A tight press-fit jig provides good holding power
and can be made quickly and accurately using
your Shopbot.
This is a good solution for holding small work
pieces, extra-thick stock, or if the material has
already been cut to its final size and there is no
room for screws.
Shown here:
two pieces of MDF have been glued
together and pocketed out to hold this piece of
hardwood. The jig is screwed to the table, then
the workpiece is pressed in.
Adhesives
Double-sided duct tape
(image ©Duck Brand)
VHB foam tapes
(image ©3M)
Super 77 spray adhesive
(image ©3M)
Adhesives can be more difficult to work with, but they offer some advantages over other methods. This can work
well for thin materials that cannot be held by a press-fit jig. More surface area = more holding power, so small
projects will require additional hold-downs.
To use tape adhesive, both the table and work piece must be clean, flat, and dust-free. If you plan to cut all the
way through the material, keep the tape away from the planned toolpath if possible (it may gum up the cutter,
reducing cut quality for the rest of the part).
For spray adhesive, we recommend a 3M product called Super 77 which forms an extremely strong bond within
minutes. To avoid damaging your table, bond the workpiece to a scrap board that is clean and flat, then clamp or
screw this board to your table. Some people prefer to glue a layer of paper between the workpiece and support
board. This can weaken the bond, but it makes removal easier. Try both methods on some scrap so that you can
compare for yourself.
Содержание HandiBot
Страница 18: ......
