fozzybear

36 minutes ago, Stub Mandrel said:

3DP is becoming mainstream.

To be honest, it's frustrating waiting for the day when I can pick up a kilo or two of PLA at the supermarket.

next to the filo pastry me thinks....

Pc controlled or via a rpi search forum... 

The ladybower inn is dark site dark site and across the road the road from the pub a carpark as well (had to giggle) blast from the past....

Pat I think you need all 5 wires connected on motor, Have a look at photo and I have also attached Zip for elegoo stepper driver board with photo's I do not have the easy driver board pinout's you could do a google search for robert brown's my focuser with easy driver as he did one with this motor

https://sourceforge.net/projects/arduinoascomfocuserpro2diy/

Andy

Elegoo ULN2003 Stepper Driver Boards.zip

we use 316 at work but would cost a fortune to ship an offcut to you we waste a lot.... but recycle it... anyway, how about a steel billet and then cold glavanise it (spraycan) cheaper?

As Sergei would say "Simples" I like what you have done Great.

by the way can you still get a quarter pounder burger, Not over here no chance can't even get the English breakfast menu miss the sausage n egg muffin and the bacon one, mouth drooling...…. ☹️

g&t = gin and tonic

just got it I am now drinking a shake, Shame they do not do them over here in France do they still do those flavoured milk drinks in the uk been 15 years since last had one...  

life is restored I had panic attacks for 2 hours had to watch the tv...… so boring

a lot faster from here in France....

http://www.opticalvision.co.uk/astronomical_telescopes-sky-watcher.html

you could try and see if they can help

6 hours ago, johninderby said:

And more brilliance from Hermes.

I ordered a watch and delivered well never arrived who is Hermes...different names myhermes,parcelhero, who are there partners and do they take care of your parcels...

Don't worry it happened to us via littlewoods back in 2002 in th UK  and the kids new Nintendo Gamecube console for Christmas  delivery driver left it behind the hedge before the days of a card as to guess where it is well we could not find it until a week later ruined Christmas we had to send it back and eventually after a month received a new one after end Jan . Nothing changed, It is Ok here in France as we have a PostBox so the regular mail man/woman, and special delivery ie TNT,UPS……… have a skeleton key to open our box and voila... safe and sound if it fits, yes other wise a trip to a neighbour or local sorting office.

send it back

This astro hobby is always modify this modify that, Don't get me started got a desk full of Arduino stuff esp8266 and wrong model... Duh need v1 smaller footprint... and on the suppliers website no mention of which version all down to a chip on the board so frustrating...

Andy 

For me got my boss to get some ptfe sheet at work 

1 minute ago, John said:

The washers that I cut are about 50mm in diameter.

you have flat sided bottles so maybe a good try for Alan

3 minutes ago, John said:

It works well

The cost is £0, assuming you can lay your hands on a used plastic milk carton.

only prob trying to get a large milk carton in plastic ours over here are 1 litre max so round..... Not like the uk 2 litre or even larger I do remember.

21 minutes ago, Alan White said:

As soon as I make any adjustment the whole secondary moves in a turning motion.
I will make have a go at countersinking a washer or the milk carton fix.

The SW ones just seem far simpler, yet more robust somehow.


 

My SW 150pds same problem the 3 collimation screws dig into the back of the sec mirror mount as it is ali

Alan,

If you can then maybe a Teflon or ptfe sheet one/two if you can get hold of it Teflon sheet that is , Never seen the milk carton Mod

https://www.amazon.co.uk/Sheet-PTFE-white-Plate-Teflon/dp/B00MR1AJK6/ref=sr_1_10?keywords=ptfe+sheet&qid=1554745538&s=gateway&sr=8-10

11 minutes ago, Alan White said:

Thanks for the input Andy.

The OOUK already has a stainless washer fitted by the previous owner/s but it still turns sadly.
 

what turns the secondary? when you do what align sec to primary

Alan,

I thought your picture had an added washer but was not sure albeit a tiny one correct? half the size of the secondary holder? if you can get hold of a drill press then use a countersunk bit all the same depth lightly sink the three guides for the bobs knobs then no twist, you might need to sand the back of secondary holder to remove any burrs on the back of the holder so it is flat

I fitted a stainless steel washer against the back of the secondary mount as the screws dug into the aluminium support for the secondary on my 150pds (skywatcher) also I did blue tip the 3 adjustment screws on  the washer and used a shallow countersunk bit as guides for the 3 adjustment bolts on the stainless washer that way nothing moves apart from the secondary mount and no twist

Andy