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Allan...
sage


Reged: 10/24/12

Loc: Penticton B.C. Canada
Drilling holes in XT8 Dob
      #5619856 - 01/12/13 09:42 PM

I was wondering how best to (if I dare) drill a hole in my XT8 OTA....would like to put on one of those rubber navigation knobs on the top end (like the ones that come with the Intelliscopes and even on the XT4.5). Not sure why they left them off the classic models. I find that grabbing the tube isn't the best method. Think the knob would simplify things. I have visions of starting the drill bit and having it SLIP and oops....one nasty scratch on the OTA. One cant really expect to use a centre punch to start the hole. Anyone got any fool proof methods up their sleeve? thanks, Clare

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CosmoSat
Pooh-Bah


Reged: 07/24/09

Loc: India
Re: Drilling holes in XT8 Dob new [Re: Allan...]
      #5619876 - 01/12/13 09:56 PM

Remove the optics along with their cells and holders and then do the drilling, one of these days u will hve to do that to clean them anyway.

Clear Skies!


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newtoskies
Pooh-Bah


Reged: 07/15/12

Loc: SE Ma.
Re: Drilling holes in XT8 Dob new [Re: Allan...]
      #5619880 - 01/12/13 09:59 PM

Try using a piece of tape and a smaller drill bit first. Drill the pilot hole slow and the tape should keep the bit from sliding. Then use the appropriate bit you need for the screw.I use this trick for drilling in ceramic tile and it work all the time.

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dpwoos
Pooh-Bah
*****

Reged: 10/18/06

Loc: United States
Re: Drilling holes in XT8 Dob new [Re: CosmoSat]
      #5619881 - 01/12/13 09:59 PM

Center punch as much as you want - what's the big deal?

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newtoskies
Pooh-Bah


Reged: 07/15/12

Loc: SE Ma.
Re: Drilling holes in XT8 Dob new [Re: newtoskies]
      #5619883 - 01/12/13 10:00 PM

Forgot...keep the OTA horizontal and place a towel in the tube to catch debris.

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JamesL
member


Reged: 10/19/12

Loc: Pacific,MO
Re: Drilling holes in XT8 Dob new [Re: Allan...]
      #5619919 - 01/12/13 10:19 PM

Possibly you could lay down a piece of 2"blue painters tape from a new roll that is not too sticky over the area to be drilled. Then use a "sharp" center punch and with the palm of your hand (instead of a hammer) apply enough pressure to create a small recess for the "sharp" drill bit to ride in.
Hold drill as purpendicular as possible and when it plunges through hopfully nothing is on the other side. Some metal shards will fall inside, make sure they fall away from any optical surfaces of course.Then slowly remove the tape as to not pull any paint off. Then vaccume it out. This is just an idea of mine, maybe someone else that has done it will chime in. Please excuse my spelling...James


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Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Drilling holes in XT8 Dob new [Re: JamesL]
      #5620009 - 01/12/13 11:24 PM

It's a little scary drilling holes in a beautiful black steel tube but it is doable without much trouble. As others have said, use a center punch, start with a smaller drill. Make sure that there is something inside to catch any shards, I often put some grease where the drill will break through. Take it slow and easy, use a sharp drill and all will be well.

Jon


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JLovell
scholastic sledgehammer


Reged: 01/12/10

Loc: Georgia
Re: Drilling holes in XT8 Dob new [Re: Jon Isaacs]
      #5620232 - 01/13/13 07:10 AM

If you are afraid of removing the optics, stand the scope vertically with the mirror end up, and have someone hold it so it won't fall over. You can put it on a chair or table to give you some room off the floor for the drill. Another possibility to help catch shavings is to put a strong magnet on the inside near, but not in the way of, the spot the drill will break through. The magnet will catch any shards that came loose on the inside. The vast majority will be outside the tube.

Another thing to try, if you have vice grips or a similar clamp, is clamping a small nut or washer with a small hole to the rim of the scope to keep the bit from wandering too much. Drill through the hole. A piece of blue tape underneath will prevent any scratches from the washer/nut and the vice grips. If you use a nut, use one you don't need, as you'll likely damage the threads.


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CosmoSat
Pooh-Bah


Reged: 07/24/09

Loc: India
Re: Drilling holes in XT8 Dob new [Re: Allan...]
      #5620440 - 01/13/13 10:19 AM

Quote:

I find that grabbing the tube isn't the best method.




But why do u think grabbing the tube isn't the best method? I think otherwise...that grabbing the tube gives more control when nudging at high powers.. In fact while moving the telescope I habitually hold both ends of the tube to have maximum control on the motion.


Clear Skies!


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NeilMac
Carpal Tunnel


Reged: 09/25/10

Loc: MedHat, AB, Canada
Re: Drilling holes in XT8 Dob new [Re: CosmoSat]
      #5620449 - 01/13/13 10:23 AM

grabbing the tube is what I do, I find it awkward to grab the knob.

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Jim Nelson
scholastic sledgehammer


Reged: 05/10/05

Loc: SE Michigan
Re: Drilling holes in XT8 Dob new [Re: NeilMac]
      #5620466 - 01/13/13 10:34 AM

When I had the knob, I rarely used it. I just grabbed the tube.

If you haven't had personal experience with the knob, I wouldn't go through the effort of installing one and drilling a hole to do so.

(Conversely, ff you have and know you want one, by all means go to it!)


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Atl
professor emeritus
*****

Reged: 04/13/12

Re: Drilling holes in XT8 Dob new [Re: Jim Nelson]
      #5620475 - 01/13/13 10:40 AM

I grab the tube...a knob seems like an unnecessary extra...just more weight.

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Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Drilling holes in XT8 Dob new [Re: CosmoSat]
      #5620477 - 01/13/13 10:41 AM

Quote:

Quote:

I find that grabbing the tube isn't the best method.




But why do u think grabbing the tube isn't the best method? I think otherwise...that grabbing the tube gives more control when nudging at high powers.. In fact while moving the telescope I habitually hold both ends of the tube to have maximum control on the motion.


Clear Skies!




One problem with grabbing the tube is that just touching the metal tube with your warm hand is likely to cause tube currents that disrupt the image. These are not big tube currents but at higher magnifications they are sufficient to affect the view for a minuter or more.

If I am going after the best possible views with a metal tubed dob, I wear gloves even if it is not cold to insulate my hand from the scope...

If I am using two hands as is sometimes necessary to track near the zenith, one hand is on the tube for the altitude motion, the other is on the base to rotate the azimuth. The base provides more leverage, finer control and does not have the possibility of creating tube currents.

As far as drilling holes. I do with the tube horizontal so the filling, or anything for that matter, cannot fall into the optics. Laying the tube on a couch provides solid backing.

Jon


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Atl
professor emeritus
*****

Reged: 04/13/12

Re: Drilling holes in XT8 Dob new [Re: Jon Isaacs]
      #5620479 - 01/13/13 10:42 AM

True. My tube is sonotube...but Orion uses metal.

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drewp
professor emeritus
*****

Reged: 05/19/07

Loc: 41.5 deg north moline ill
Re: Drilling holes in XT8 Dob new [Re: Atl]
      #5620688 - 01/13/13 12:29 PM

i have never heard of heat from the hand having any effect on tube currents. turn on your fan and forget the knob.

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Haas
sage


Reged: 11/22/12

Loc: Wis., USA
Re: Drilling holes in XT8 Dob new [Re: drewp]
      #5620722 - 01/13/13 12:48 PM

Couldn't center punching, create a rather large indent on the tube? I know you want a dimple for the drill to "find", but it seems there's a risk that a large portion of the tube could dent inwards from the impact.

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planet earth
Pooh-Bah
****

Reged: 09/07/10

Loc: Ontario Canada
Re: Drilling holes in XT8 Dob new [Re: Atl]
      #5620735 - 01/13/13 12:54 PM

Quote:

a knob seems like an unnecessary extra...just more weight.




Well if you use an old brass door knob and hang your coat on it, what do you expect?
Sam


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howard929
Member
*****

Reged: 01/02/11

Loc: Low End of High Ground
Re: Drilling holes in XT8 Dob new [Re: Allan...]
      #5620736 - 01/13/13 12:54 PM

A Strap-A-Handle or two would be an ok work around to drilling as well as a way to carry the OTA.

Edited by howard929 (01/13/13 12:55 PM)


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StarCurious
member


Reged: 12/24/12

Loc: York Region, Ontario
Re: Drilling holes in XT8 Dob new [Re: howard929]
      #5620817 - 01/13/13 01:42 PM

Try Google suction cup handle, and found something like this:

http://www.amazon.com/Vacuum-Suction-Handle-Dent-Puller/dp/B003NU0EM8/ref=pd_...

Don't know if it would be too strong and distort your OTA.


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jimdp
journeyman


Reged: 06/17/12

Loc: Vista, CA
Re: Drilling holes in XT8 Dob [Re: Allan...]
      #5620858 - 01/13/13 01:59 PM

J b weld with a wooden knob...now were talking custom..

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