Civil Engineering Reference
In-Depth Information
Fig. 10.5. A spin indexer is ideal if the divisions required are full degrees. The division
plate has holes around the outside while the pin can go in one of several holes to
give a vernier type movement in whole degrees.
A spin indexer comes with a plate and holes in the body to divide a job into
1 degree increments. If only drilling some holes around the job, perhaps in an
irregular pattern, you can make a replacement indexing plate, with only the
required holes, to fit the spin indexer. I have done this on several occasions
and it has saved loads of time and prevented scrap work.
SIMPLE DIVIDING BY 3, 4 OR 6
Using 5C collets has been mentioned earlier.
You can buy square and hexagon blocks to take 5C collets. You put the
component in a collet in the block and then put the block into the vice to ma-
chine the work. You can work on any of the two, three, four or six faces by
turning the block in the vice.
You can also make your own blocks that take the component direct by
drilling a good fitting hole through the hexagon or square block, and drilling
and tapping a grub screw hole to lock the component in place.
You can also put a bolt through a component and index from the hexagonal
head of the bolt, or you can bolt a square plate to the component and index it
by using a square to the flat face.
