Crayford Focuser Needs Pulled Out

[Stevekerr]

Not sure how to fix this but the focuser on my SW 300 Dob moves smoothly enough but when it is fully in it won’t move out unless I pull the tube out slightly. I can’t immediately see an adjustment to fix this. Thinking it might be missing a washer or something? If anyone has experienced and fixed this issue I’d be grateful for their advice. 
 

Thanks

Steve

[bingevader]

Not enough friction for some reason.

I'm assuming that you have tried tightening or loosening the fittings?

Mine is a bit slippy at the moment, I've been meaning to take it apart and clean it.

Maybe it just needs a bit of an overhaul?

In the meantime, try not to move it all the way in!

[cajen2]

(If yours is like mine), have you tried adjusting the small knurled knob at the base? If this is too loose, the focuser won't grip properly.

Edited April 11, 2022 by cajen2

[Stevekerr]

4 hours ago, cajen2 said:

(If yours is like mine), have you tried adjusting the small knurled knob at the base? If this is too loose, the focuser won't grip properly.

I’ll give that a go thanks

 

[Stevekerr]

4 hours ago, bingevader said:

Not enough friction for some reason.

I'm assuming that you have tried tightening or loosening the fittings?

Mine is a bit slippy at the moment, I've been meaning to take it apart and clean it.

Maybe it just needs a bit of an overhaul?

In the meantime, try not to move it all the way in!

Thanks. I’m trying, I’m trying.😀

[Spile]

6 hours ago, Stevekerr said:

I’ll give that a go thanks

 

Not with mine it doesn’t. If you are taking about the single silver coloured thumb screw, then when tightened is locks the focuser. I keep mine totally unscrewed.

[Mr Spock]

The silver bolt is the locking screw. One the focuser plate there are five screws, the centre Grubb screw adjusts the tightness.

[barbulo]

I solved the same issue in my 130PDS playing with these 3 screws (I have no locking screw since I use a EAF):

To do so, I put the payload inwards (vertically I mean) and adjusted the bolts until the EAF was able to move the train upwards against gravity. 

[cajen2]

Sorry @Stevekerr I was mistaken. Yes, the silver knob is the locking screw and the tension is set by the grub screw in the centre.

🙄