Forum Replies Created
-
AuthorPosts
-
Mr Jack MartinParticipant
Lee,
Not sure if this company will have what you want but worth an inquiry;
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
That’s a neat mod with the smaller motor.
Attached is a pic of my finished mod with the Skywatcher motor.
I tried it out on Sunday night and got double calibration lines l l (don’t have a pic) when I took the drive belt off and focused manually it settled down to give single calibration lines l .
What’s causing this to happen ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
The collimating lens worked loose in my Lhires but is easy to fix.
I advise Lhires users to check just in case.
Regards,
Jack,
Essex UK
Mr Jack MartinParticipantThank you all for your input, lots to consider here.
Almost finished motorising the collimating lens, I wrapped a 3 mm wide strip of Velcro round the edge of the lens which grips the belt and works best at fastest rotation speed setting on the handset.
I will test the system and make any changes as necessary as per your suggestions.
Once complete, this should be a more user friendly set up and relatively cheap to convert.
Regards,
Jack
Essex UK
Mr Jack MartinParticipantPeter,
I suggest you try British Astronomical Spectroscopy Software at
https://uk.groups.yahoo.com/neo/groups/astrobodger/info
Hope this helps,
Jack
Essex UK
Mr Jack MartinParticipantAlun and Robin,
Thanks for your advices.
I will take measurements as suggested.
A tear down sounds like a good idea which should sort any instability problems.
1. There is a problem with wavelength shift any idea what’s causing this see attached.
2. The calibration lines are in focus at start and can go out of focus at the end of the session.
Both problems occur on and off, before motorising the collimator lens adjustment, I don’t expect that to make any difference.
Has anyone else had these problems ? if so how did you overcome them ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
Which side did you remove the screw from the collimator body ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
Thanks for the link, some good modifications.
I can put one cover back on once I have got the belt gripping properly, will try putting o rings over the lens thread.
The Lhires is contained in a film changing bag which should keep dust and light out.
A question, as I do not operate the spectrograph remotely is there any point in motorising the micrometer arm ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
I found a belt that fits from RS Components;
https://uk.rs-online.com/web/p/timing-belts/7785064/?sra=pstk
Saves cutting and gluing.
The belt around the lens keeps slipping, but sort of works, I will try some Velcro or o ring.
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
Found this on Robot shop is it suitable ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
Thanks for your advices. and pictures.
Today I installed the Skywatcher motor to the Lhires.
I have yet to get a suitable drive belt.
What is the yellow attachment on the motor shaft ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlan,
Thanks for clarifying I will order the Skywatcher.
Which is the smaller of the two, top or bottom picture ?
How long is the belt ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantBill,
Nice spectrum and excellent movie on U tube.
Good work.
Jack
Essex UK
Mr Jack MartinParticipantAlun,
Which motor have you ordered ?
And why can’t you use a slotted bracket ?
From your posts I am minded to go with the Skywatcher, any reason not to ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
RVO say Skywatcher or JMI will do the job.
Its not a question of money, but what works.
Bulkiness should not be a problem, I use a film changing bag to keep the unit light tight which should also accommodate the motor.
I suggest a slotted bracket would be good if the belt needs adjustment.
This is a great improvement.
Thanks for your efforts,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
Thank you for further information.
Looking at the link its difficult to see how the JMI would work without some modification, there appears to be no shaft correct ?
Is there one similar to the Skywatcher ? which appears to bolt straight on to the Lhires body.
Regards,
Jack
Essex UK
Mr Jack MartinParticipantGrant,
I use Team viewer or Tight VNC PC to PC to control the mount remotely via a 25m Maplin Cat6 Ethernet cable.
BEWARE you will need to protect / sleeve it when installing against foxes, it was bitten into but survived.
I can open / close the motorised roll off roof remotely with a key fob.
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAlun,
Thanks for the link and further info.
Shame that motor is a bit bulky, I assume you don’t have it permanently set up in an observatory.
Wouldn’t a bigger case be a cheaper option than another motor and having to replace what works ?
I see there are a few options from RVO to consider;
https://www.rothervalleyoptics.co.uk/jmi-motofocus-for-celestron-c8-.html
Please can you post a picture showing how and where the motor is attached / bolted to the Lhires.
How many holes did you have to drill ?
This is a worthwhile modification.
Thanks for your efforts.
Jack
Essex UK
Mr Jack MartinParticipantAlun,
Excellent work well done.
I would like to do the same conversion for the collimating lens on my Lhires.
What belt would you recommend and from where ?
Regards,
Jack
Essex UK
Mr Jack MartinParticipantAndy,
Which dehumidifier do you use and where is it available from ?
Regards,
Jack
Essex UK
-
AuthorPosts