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About skybadger

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    Sub Dwarf

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    Riseley Berkshire

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  1. I would take the view that the stiffness ought not to be there. It's setup with bearings so were it not for any clutch interaction, should spin freely. My eq8 moves not quite easily but it's not stiff. The motor imbalance causes it to tip for example after it passes the meridian, when it's off the clutches.
  2. Anyone, whats the comparison between a ccd L filter and a V filter ? Is there a standard relationship or an experimental way of determining one, without having a V filter to hand ?
  3. I'm split on this, nice chap, engaging subject, some big claims and nothing to back them up. Lucky imaging in this case is about freezing the seeing at the timescale of seconds or less. For me the maths don't add up, maybe I'm missing the mass effect ? For example why diss cats when some are built for fast imaging ?
  4. There's a good story to that inclined grub idea. Lots of thread path and more force at the surface. I'll look into that some more. Ta.
  5. I'd like to see the output of that, I did something similar in the morning of the 13th. I'll post it up here.
  6. While I imaged a bright star yesterday, today I couldn't reliably find it to put in the spectrograph slit. I'm glad to see I wasn't being dumb.
  7. https://www.aavso.org/aavso-unique-identifier - I think you need membership
  8. The wheel I'd like to use. https://www.bilcastors.co.uk/product/bza60wgr/ The wheel I am replacing because they don't make the hard tread variety any more. https://www.robotshop.com/uk/rb-ban-91-orange-wheel.html. It solves the attachment problem by using a 12m hex hub and grub screws to the 8mm shaft but the tread does pull itself apart over time. They have stopped making the harder tread variety. The bogies these wheels have to go on look like this: The space is very limited due to having to fit between the walls of the dome. I should add pinn
  9. Hi Peter I don't have experience with red loctite - does it bind well to metal and plastic ? I'll look it up as an option. Thanks
  10. Hi all I have a dome with dome drivers using 4 motors and a set of drive wheels on each. They use wheels mounted to the shaft of the motor by grub screws to do the driving of the dome. Unfortunately the wheel treads are quite soft and need to be replaced. I've found an easy replacement using some harder plastic wheels with a harder rubberised tread but they are plain bores. My question is - is there a best way to fasten them to a steel shaft so they are reliably fixed ? The shaft is an 8mm d- profile . I can get the wheels in 8mm plain bore or 6mm plain bore and drill them out to a
  11. I've been imaging this nova since the start of may , on as much as a daily basis as I can and then using maxim photometry to determine a photometric time series that both measures and shows the changes. Here's an example image: Where the nova is the bright star in the middle. The image is bias, dark and flat fielded. But my time sequence isnt showing the variations you mention. Anyone familiar with Maxim and photometry ? The star chart and reference table below are form the AAVSO plot generator, cover 2 degrees and down to Mag 14. Nova cas photo
  12. Drill either a new set of holes for the primary and move it up the tube or do the same for the secondary but move it down, it's trivial and takes basic measurement and drilling skills. I have done this several times on a home build and commercial scopes.
  13. To answer Ken's question, the wiki is a bit nerdy but with a few rereads it makes sense and it gets better all the time. The groups.io forum is also helpful and responsive.
  14. Id recommend onstep using the CNC v3 board for a very low cost, easy to build system that will be cheap enough to test with. You need the right stepper motor driver chips, the tmc series (but should probably use the simpler drivers for a solder less solution ) and make some sensible stepper motor choices from motion products or elsewhere but you can get running very cheaply and the system is highly functional.
  15. There used to be a product called goto4all that used the Meade handcontroller and some of its drive parts. That had a belt delivery and provided belt tensioning. Worked well and was a good replacement for a broken vixen handset. There are numerous belt adaptations of the SP on the onstep wiki to look at.
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