Homebrew PCBs

JanRwl@... wrote:

>  
> In a message dated 5/30/2005 10:49:54 A.M. Central Daylight Time,  
> leon.heller@... writes:
> 
> You get  couplings that take up misalignment, like Oldham  couplings.
> 

   Um why are you guys worrying about misalignment?  You're supposed to be 
taking it out of the machine not leaving it there.  Alignment is the primary 
skill required to make anything of this sort.  Get a handle on that first and 
then don't make things misaligned from the start.
> 
> Trouble with those is, they do not "fasten" the "motor-end" of the  screw.  I 
> simply machined hollow hubs with "interference-fit" bores for  screw-end and 
> motor-shaft, oh, but NOT "set-screws", but CLAMP type fit.   Required a bit 
> more care in machining, but result is the screw is axial with the  motor and is 
> rigid, depending on motor's bearings for thrust AND radial  bearing.
> 
> 

   You already have to mount bearings for the other end.  A few minutes and few 
bucks spent making 3 more of the same type mounts or making whole new parts that 
required machining in the first place, and care in it in the second.  I think I 
would go the other way.

   Considering I hardly ever touch a set screw, I don't see any benefit to a 
clamping system either.  These couplers were cheap.  If I bothered to find my 
loctite and put in the set screws I'd likely never touch them again.

   What I've got required nothing but a drill, bits, saw, screwdriver and 
wrench, and a good square to make.  May have been some other simple, cheap tool 
or two used too but I don't recall it off hand.  That's for a basically all 
metal machine, the wood for the bottom and mounting plate are simply for 
convenience to mount things, they could easily be made metal, it just wouldn't 
make any sense to do so.  The idea of knocking that up ten notches and needing 
any type of real machine tool to do something is sort of counter to the whole 
thing..

Alan