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Just finished modding my dob base.

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156 replies to this topic

#1
Daz Type-R

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First of all I have to hold my hands up and say a massive thank you to johninderby, without his help and guidence I would never of thought of this mod.

I was tired of my dob base being so difficult to move in small amounts, I would completly shoot away from Jupiter (or anything as a matter of fact) while trying to track it, it was starting to get annoying.

So with the help of a lazy susan bearing, 4, 1 inch slide guides, some plastic milk bottles (empty) I set about modding my base.

Well I have just finished and it is now perfect, the scope now glides around with the slightest movement (but not that slight that it is constantly spinning). I have just been out side to see if I could "track" anything and surprise surprise, cloudy as hell!

Roll on another clear night so I can try out my new mod.

Can't quite beleive it was so simple to do and only cost about £30 and an hour of my time!

Happy days!!!!!!

:)
  • Eastridge likes this

Skywatcher Skyliner 200P Dobsonian (8").  Astrozap dew shield.  Modded base plate (lazy susan bearing). Setting circle mod. Guide here.  Wixey digital angle gauge.  Skywatcher right angled correcting finder scope.  Telrad - with home made dew cover.  Moonlite focuser.  Kendrick 2 channel 4 port dew controller.  Kendrick Telrad heater, 2 x finder scope heaters, 2" ep heater and home made secondary heater.  Baader Laser Collimator Mark III.  Cheshire Collimator.  1.25" Variable Polarising Moon filter.  Televue 13mm Ethos 100° EP.


#2
jimmyjamjoejoe

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Ok i gotta know what you did... post some pics?

#3
Moonshane

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nice one Daz - modding is obligatory if you own a dob :)

Don't think, feel! It is like a finger pointing a way to the moon.

Don't concentrate on the finger or you will miss all that heavenly glory. Do you understand?

(Bruce Lee in Enter the Dragon)

It applies to eyepieces too

 

Messier 94/110 NGC 186/7836 Caldwell 23/109 Herschel 91/400 (non NGC) IC 1/179 Collinder 93/471 Stock 3/24 Melotte 32/245 Trumpler 1/37 Best 700 183/700 Cambridge showcase double stars 42/111 (123) (133) Lunar 66/100 Comets 7 Planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune


#4
jbk44

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Pic's pleeeez, or at least instructions. I know the feeling of Jupiter flying off all too well.
Posted Image S/w 200p dob, Revelation 20 x 80 bino's, Roadkill Meade etx70(dead point to), Eos 450d unmod. S/w 300p special chair mod dob.

#5
johninderby

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Glad it turned out OK. :)

That's the beauty of the dob design. There are so many ways to improve it without spending a lot, or needing the skills of a master craftsman.

John

#6
Daz Type-R

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Okay guys, I will get some photos up, I will post the links and exact prices of what I used and a guide of what I did. Will get on this Monday night.

Skywatcher Skyliner 200P Dobsonian (8").  Astrozap dew shield.  Modded base plate (lazy susan bearing). Setting circle mod. Guide here.  Wixey digital angle gauge.  Skywatcher right angled correcting finder scope.  Telrad - with home made dew cover.  Moonlite focuser.  Kendrick 2 channel 4 port dew controller.  Kendrick Telrad heater, 2 x finder scope heaters, 2" ep heater and home made secondary heater.  Baader Laser Collimator Mark III.  Cheshire Collimator.  1.25" Variable Polarising Moon filter.  Televue 13mm Ethos 100° EP.


#7
Ptarmigan

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Happy days!

Well done you and John !
being in the market for a serious upgrade, perhaps into the big Skywatcher dobs range, (I presume you speak of your "Skywatcher Skyliner 200P Dobsonian (8")" in your sig. ? )
I would (as the other folks) luv to hear the nitty-gritty

ta,
Malcolm.

Edited by Ptarmigan, 03 October 2011 - 12:37 AM.


#8
Daz Type-R

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Evening all.

As requested here is a break down and pics (hopefully) of what I did to mod my dob base.

This is based on my dob base, I do not know if other dob bases differ in size (I`m assuming they do) so you need to take that into account if modding yours.

First thing first, below is a shopping list of things you need.....

1. http://simplybearing....ducts_id=42341 - This is the 12 inch lazy susan bearing, I went for the 12 inch just to help with weight distribution but to be honest any size will do. This cost a total of £20.22 which was including Royal Mail 1st class delivery and VAT. Fantastic service - ordered at 12:30 on a Monday lunch, arrived at work 9:30 the next morning. 2-3 minutes to set up an account.

2. I found these on Amazon, do a search for slide guides, I used the 1" version but I`m sure the 2" version will be just as good, these set me back £6.97, service was okay, took 3 days to arrive. I beleive you can also get these from B&Q or similar places.

3. Plastic milk bottles - you should need no more than 2. I used the 2 ltr bottles.

4. Screw drivers, pencil, ruler and screws (screws need to fit the holes in the lazy susan bearing and be no bigger then 15-18 mm in length)

So the first thing I did was take the base apart, so that you just have the base in front of you. Next, draw a square round the centre hole in your base plate making sure the sides of the square are as close to the centre hole as you can get. (see Fig 1)

Next draw 2 straght lines going through each corner of the square right to the very edge of your base plate, so now you have basically divided your base into quarters.

Next line the 4 mounting holes on your lazy susan bearing up with the 4 lines you have just drawn. Once all 4 mounting holes have a line through the middle of them then your bearing is correctly in place and in the exact centre. Now screw it down. (see Fig 2 & 3)

The next step is to now add your slide guides (see Fig 4) (if even needed) you may be happy with the level of glide provided by the bearing. If not, now line your slide guides up along the 4 lines you have previously drawn. You need to place these as close to the edge as you can. If not, then they will catch on the mount part of your base (the part that holds the scope) stopping the mount from turning. Your base should now look something like Fig 5.

You may find that the slide guides do not even touch the top part of the base, if so use your plastic milk cartons to make washers and stack them up under the slide guides screwing them down until the slide guides just touch the top part of the base. (see Fig 6, 7 & 8)

Thats it. You may have to keep building and and taking to bits your base until you achieve the correct level of resistance provided by the plastic milk washers but it is worth it in the end.

Hope this is enough info for you and you find the guide helpfull.

Regards,

Daz.

Attached Thumbnails

  • Fig 1.jpg
  • Fig 2.jpg
  • Fig 3.jpg
  • Fig 4.jpg
  • Fig 5.jpg
  • Fig 6.jpg
  • Fig 7.jpg
  • Fig 8.jpg

Edited by Daz Type-R, 03 October 2011 - 10:51 PM.

  • iamjulian, Eastridge and beyboo like this

Skywatcher Skyliner 200P Dobsonian (8").  Astrozap dew shield.  Modded base plate (lazy susan bearing). Setting circle mod. Guide here.  Wixey digital angle gauge.  Skywatcher right angled correcting finder scope.  Telrad - with home made dew cover.  Moonlite focuser.  Kendrick 2 channel 4 port dew controller.  Kendrick Telrad heater, 2 x finder scope heaters, 2" ep heater and home made secondary heater.  Baader Laser Collimator Mark III.  Cheshire Collimator.  1.25" Variable Polarising Moon filter.  Televue 13mm Ethos 100° EP.


#9
Ptarmigan

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Thanks Daz,
very interesting, filed for future ref. :)

cheers,
Malcolm.

#10
Space Beagle

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Hmmmm! Like the look of this mod!
I wonder if it'll be an improvement on the old LP and teflon pads I use at the moment in my homemade dob' base. Mine works ok, but this does look like it'll be better!!

Doc

Location: Boston, Lincolnshire
Scopes: F5 200P on homemade Dob base, F10 Tal 100RS #0095 on EQ5
EPs: Too Many!!! Nagler Zoom 3-6, Meade HD 60, Baader MkIII Zoom 8-24, Delos, Maxvisions, Naglers, BCO, TeleVue Plossls.
Binos: Opticron Imagic 10 x 50, Celestron Skymaster 15 x 70. Messier Objects 25/110


#11
Adz

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Thanks muchly for the guide Daz. I had put a lazy susan on my dob base and was really struggling to get the resistance right. It would either be too much (with bits of neoprene) or spinning like a merrygoround. I shall buy some of those gliders and stock up on milk :rolleyes:

Just before I buy, I assume the 2" ones are too big for the screws that hold the mount that revolve around the outside?

Edited by Adz, 12 October 2011 - 02:53 PM.

200P, 10x50 Binos, 550D, 31Nag, 13Eth, 8Eth, 2xPM

#12
Daz Type-R

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Hi. No problem, glad you found the guide usefull. I`m not too sure to be honest. Thats what I thought so that is why I went with the 1 inch ones just to be sure. As you can see from the pictures, still mucked it up and placed them too close to the inside, hence why there are 2 sets of holes :rolleyes:.

Also with the slide guides, you may have to remove the sticky back film, it was on a soft 2-3 mm base which was too much for my base, so I removed that, cleaned all the glue off the back and then used the washers to get the resistance right and screwed them down rather than sticking them down.

Good luck and let us know how you get on.

Skywatcher Skyliner 200P Dobsonian (8").  Astrozap dew shield.  Modded base plate (lazy susan bearing). Setting circle mod. Guide here.  Wixey digital angle gauge.  Skywatcher right angled correcting finder scope.  Telrad - with home made dew cover.  Moonlite focuser.  Kendrick 2 channel 4 port dew controller.  Kendrick Telrad heater, 2 x finder scope heaters, 2" ep heater and home made secondary heater.  Baader Laser Collimator Mark III.  Cheshire Collimator.  1.25" Variable Polarising Moon filter.  Televue 13mm Ethos 100° EP.


#13
spaceboy

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Great guide Daz. Glad to hear you found the LS bearing is an improvement.

#14
Damo636

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Excellent guide Daz.

Damo

 

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#15
Adz

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Thanks for the tutorial. I bought the 2" ones (anyone reading this don't, get the 1" ones instead).

I had to overlap them so they squidge out of the middle of the two boards - like jam in a sandwich :D Works like a treat though!
200P, 10x50 Binos, 550D, 31Nag, 13Eth, 8Eth, 2xPM

#16
Daz Type-R

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Fantastic. Glad it has worked out for you. Shame about the glides sticking out the side, but I would rather have that, then nothing at all. Can't quite believe that Skywatcher don't improve their base. Suppose it is down to cost.

Skywatcher Skyliner 200P Dobsonian (8").  Astrozap dew shield.  Modded base plate (lazy susan bearing). Setting circle mod. Guide here.  Wixey digital angle gauge.  Skywatcher right angled correcting finder scope.  Telrad - with home made dew cover.  Moonlite focuser.  Kendrick 2 channel 4 port dew controller.  Kendrick Telrad heater, 2 x finder scope heaters, 2" ep heater and home made secondary heater.  Baader Laser Collimator Mark III.  Cheshire Collimator.  1.25" Variable Polarising Moon filter.  Televue 13mm Ethos 100° EP.


#17
Adz

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I would rather have a great working smooth scope than something that looks good any day :D

Do you find the Wixley worthwhile?
200P, 10x50 Binos, 550D, 31Nag, 13Eth, 8Eth, 2xPM

#18
Daz Type-R

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Yeah, I would say it is worthwhile. I only ever use when looking for DSO that are hard to find with the naked eye, it just gets you in roughly the right angle, then a bit of left and right here and there and you tend to find what you are after. The only trouble is you have to get it really, really level for it to be of any use. I have a laser level device at home for when hanging shelves etc, so I use that. You only have to be a degree out in setting it and you will miss your object completly.

Skywatcher Skyliner 200P Dobsonian (8").  Astrozap dew shield.  Modded base plate (lazy susan bearing). Setting circle mod. Guide here.  Wixey digital angle gauge.  Skywatcher right angled correcting finder scope.  Telrad - with home made dew cover.  Moonlite focuser.  Kendrick 2 channel 4 port dew controller.  Kendrick Telrad heater, 2 x finder scope heaters, 2" ep heater and home made secondary heater.  Baader Laser Collimator Mark III.  Cheshire Collimator.  1.25" Variable Polarising Moon filter.  Televue 13mm Ethos 100° EP.


#19
knobby

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So does the top part of the mount just sit on the Lazy Suzan ...
does the top part move about much (laterally) with the centre bolt now having a longer reach...
Why 4 glides and not 3 ...
Is it rumbly or smooth sounding ...
Can we have a dedicated Dob modding thread ...
Pimp my Dob ?


Nice job by the way
  • dobsonuser likes this

Skyliner 250px Dob with modded mount
Celestron Excel LX s and the odd plossl, Celestron C8 edge / advanced vx mount (grab & go...ish)

William Optics Zenithstar 71 ED ----- Lots of clouds

Co. founder of the Essex cloud dodgers social group
Nikon D300 & 7100 , ASI 120 MC


#20
knobby

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Does anyone know the Diameter of the 8" dob base, is it much larger than the 6" ?

Cheers

Skyliner 250px Dob with modded mount
Celestron Excel LX s and the odd plossl, Celestron C8 edge / advanced vx mount (grab & go...ish)

William Optics Zenithstar 71 ED ----- Lots of clouds

Co. founder of the Essex cloud dodgers social group
Nikon D300 & 7100 , ASI 120 MC





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