Re: ATM Re: ALTITUDE DRIVE MOTOR

[astrojoe@erols.com]

Hi Andy,

Let me understand what you are saying. Do you believe that I just did
not stretch the belt tight enough ? Therefore, proper tighening will
solve the problem ?

Joe



iss@pvtnetworks.net wrote:
> 
> Hi Joe, Jim
> 
> * = last letter of alphabet, keyboard is messed up...
> 
> >Our arrangement is slightly different. The commercial unit we have built
> >for 3 large dobs ( 25", and a pair of 32" ) are using a clutched pulley
> >gear and the side of the altitude bearing. The belt runs around a 12"
> >upper clutched pulley to a lower driven pulley. The lower pulley is
> >about 20" awy from the main clutched 12" pulley. What we are seeing on
> >engaging the altitude drive is the pulley belt will slacken on the side
> >of the gear that it is being driven into. Simpler put, energize the
> >altitude motor and one side will go slack while the other stays tight.
> >Both sides are tight to begin with. I was thinking of using a heavy
> >spring to keep the altitude drive assembly in constant tension to avoid
> >the belt slacking problem. When I saw your PICS, I thought you had the
> >same problem, not realizing te real reason you used the spring ( clutch
> >action engagement ). I think I will post this one to the atm list and
> >see if anyone has an answer. Maybe Andy Saulitius........
> 
> My methods with elev drives have used either roller chain or
> dual reduction metal/metal rollers/disks. The chain can
> be tightened a *lot* with virtually no stretch, and the dual
> roller friction drives, with lapping compound to increase
> friction, show virtually *ero periodic error or backlash.
> They're not much good for high speed slewing, though.
> 
> Andy
> Andy Saulietis / ISS Alt-Az-Fp Drive Systems
> HDPE Worm Gears, Custom designs & Machine work
> 39 Silver Fox Trail
> Cloud Country Estates
> Mayhill NM 88339
> 505-687-3067 Voice
> 505-687-3021   Fax
> e-mail: iss@pvtnetworks.net
> 32 54 13 N  105 31 44 W 7300' elev
> 
> How come you never hear about gruntled employees?