connecting a grampa bear wood stove

This if often dependent on the exact brand of pipe!

I will assume that you have a pipe going straight up into a ceiling support and Dura-vent pipe, one of the earlier popular triple wall brands!

There are a couple things you need to be aware of.....

1. The black stove pipe should fit around (over!) the inside pipe of the triple wall up in the ceiling support! This assumes the lack of a specialized pipe adapter..which if you had one, it would already be hanging down and you'd simply slip your black pipe around it.

2. The female (larger non-crimped) end of the black pipe should go up.

3. This joint, once trial fit, should have some furnace cement put in it and then be screwed together. On some pipe you cannot reach up in there to screw it, so you screw your black pipe to the flange where it goes through the ceiling support (it often has hole pre-punched there).

That's about all the advice I can give without pictures or better explanations of exactly what you are looking at!

Fisher has some strange sized flue collars....

See:
http://hearth.com/econtent/index.php/forums/viewthread/66/
http://www.hearth.com/econtent/index.php/QA_Templates/info/1015/
http://www.hearth.com/econtent/index.php/forums/viewthread/11003/

Google stove pipe crimp tool.
This is the tool mentioned in above threads that makes the stove pipe smaller. Anytime you cut a piece of pipe shorter, you need them to crimp the end of the pipe to fit it into another piece. Simply crimp the end down until it fits into the stove.

I do it just like that pic - but, after I am done crimping it good, I grab it with the tool and bend it back so it is somewhat parellel to the rest of the pipe. This lets it fit better into the collar...as opposed to the steep angle.

Add furnace cement and a couple screws and you have it (drill screw holes if none exist)