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Equipment Discussions >> ATM, Optics and DIY Forum

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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Round Wooden Tubes? new [Re: tim53]
      #4283143 - 12/31/10 05:37 PM Attachment (51 downloads)

Done except for buying brass fasteners to hold the lens cell and focuser. The ones sticking out of the lens cell end are temporary.

Next, I'll have to figure out how to mount it!

-Tim.

Edited by tim53 (12/31/10 05:38 PM)


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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Round Wooden Tubes? new [Re: tim53]
      #4283148 - 12/31/10 05:39 PM Attachment (41 downloads)

too

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dan_h
Carpal Tunnel


Reged: 12/10/07

Re: Round Wooden Tubes? new [Re: tim53]
      #4283247 - 12/31/10 06:25 PM

Really nice. I like the color combo!

dan


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rboeAdministrator

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Reged: 03/16/02

Loc: Phx, AZ
Re: Round Wooden Tubes? new [Re: dan_h]
      #4284481 - 01/01/11 11:06 AM

Say Tim, how about some brass focuser knobs?

It looks so good I"m thinking of going the wood tube route instead of the kit that seems to be on long term hold. As fast as I work the kit may be available first.


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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Round Wooden Tubes? new [Re: rboe]
      #4284528 - 01/01/11 11:23 AM

Ron:

I've thought about giving it a test drive and maybe adding a Crawmach if it's really good. So far, daytime views have been very nice, but I'm hand-holding it until I can make some rings that won't hurt the finish!

But that's just Rustoleum "old brass" paint over aluminum. Last time I bought a 1 5/8" x 12" bar of brass, it cost me $37. But I sure like turning brass on the lathe!

-Tim.


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PhotoGazer
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Reged: 09/26/07

Re: Round Wooden Tubes? new [Re: tim53]
      #4288440 - 01/03/11 09:18 AM

Thanks for those snarking this thread about round wooden tubes. Yes, I am quite aware that they are not "truly" round. I have NEVER heard them called "faceted". But what we are talking about is closer to round than they are to square, and everyone else seemed to know what we were talking about as well. On to more questions. Thanks for the posting of that circle calculator link, but I find it very difficult to use. Does anyone know the formulas that would allow me to insert into an excel spreadsheet that would allow someone to put in values such as "Inside Diameter", "Number of Strips", "Strip Thickness", and get the spreadsheet to do the calculations to let me know how wide to make the strips, and the angle of the cuts to produce the tube tube with the ID desired?

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rboeAdministrator

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Reged: 03/16/02

Loc: Phx, AZ
Re: Round Wooden Tubes? new [Re: PhotoGazer]
      #4288471 - 01/03/11 09:42 AM

Google search is dicey. You want to make staves and typically you want to know the number of strips/staves from the get go.

There are predetermined angles for known stave counts and folks even make router bits for that angle. But they don't tell you the width you need for a given diameter.


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Pinbout
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Reged: 02/22/10

Loc: nj
Re: Round Wooden Tubes? new [Re: PhotoGazer]
      #4288620 - 01/03/11 10:59 AM Attachment (40 downloads)

Here's from Machinery's Handbook:

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Biff
Carpal Tunnel
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Reged: 09/04/05

Loc: Tampa, FL
Re: Round Wooden Tubes? new [Re: rboe]
      #4288672 - 01/03/11 11:19 AM

Quote:

... and folks even make router bits for that angle.



Didn't even think of that. Sound like it would eliminate a lot of error rather than trying to dial in the TS blade to a good amount of accuracy.


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Pinbout
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Reged: 02/22/10

Loc: nj
Re: Round Wooden Tubes? new [Re: Biff]
      #4288744 - 01/03/11 11:49 AM

I always use a bevel protractor to set the angle of the blade, especailly when making compound angle cuts. Makes all the difference.

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nytecam
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Reged: 08/20/05

Loc: London UK
Re: Round Wooden Tubes? new [Re: Pinbout]
      #4290546 - 01/04/11 04:38 AM

Quote:

I always use a bevel protractor to set the angle of the blade, especailly when making compound angle cuts. Makes all the difference.


Can a single bevel cut suit two adjoining sections if one piece is reversed

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Pinbout
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Reged: 02/22/10

Loc: nj
Re: Round Wooden Tubes? new [Re: nytecam]
      #4290753 - 01/04/11 08:48 AM

yes, it's a theorem in geometry

Parallels:

Alternate Interior Angles - If two parallel lines are cut by a transversal, then the alternate interior angles are congruent

Alternate Exterior Angles - If two parallel lines are cut by a transversal, then the alternate exterior angles are congruent.


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Attaboy
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Reged: 08/15/09

Loc: Round Rock, TX
Re: Round Wooden Tubes? new [Re: Pinbout]
      #4296312 - 01/06/11 03:04 PM

As a cheap alternative, you can use your miter saw, if you have one, to cross cut a 3" wide board and use that to set your tablesaw blade. You can usually get within half a degree with your miter saw... Chuck

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Chriske
Kijkerbouw Urania
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Reged: 08/15/04

Loc: Boechout, Belgium
Re: Round Wooden Tubes? new [Re: tim53]
      #4296449 - 01/06/11 03:52 PM

Hi guys,

Another possible and simple way making 'wooden' tubes is using hardboard. Making hardboard wet one can bend it anyway you like. We use to make scopes out of this material.
You need water ....lots of it...!
It'll take you about 20 minutes to make a round tube out of a sheet of hardboard. Two of these tubes glued in one another makes a VERY strong, yet very light tube. You could stand on such, it won't deform at all. Not as light as carbon I know, but much cheaper. A 12" hardboard tube, 8 feet long will cost you about 7$ , glue included.
Some pictures...
(If I'm not mistaken I've posted this a few years ago... )







This is a smaller one 10" diameter almost 6 feet long.



We had lost of fun making these. Especially during hot weather...
These days we make trusscopes during course.


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dan_h
Carpal Tunnel


Reged: 12/10/07

Re: Round Wooden Tubes? new [Re: Chriske]
      #4296471 - 01/06/11 04:03 PM

Amazing! Thanks for posting.

dan


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Bob Myler
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Reged: 05/18/06

Loc: St Louis, MO
Re: Round Wooden Tubes? new [Re: dan_h]
      #4296918 - 01/06/11 07:11 PM

Chris, could you share some more details on on how to bend/glue/seam hardboard - perhaps under a separate thread?

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rboeAdministrator

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Reged: 03/16/02

Loc: Phx, AZ
Re: Round Wooden Tubes? new [Re: Bob Myler]
      #4297373 - 01/06/11 10:46 PM

Chuck! I had hoped to go see you in Cave Creek some day - but you moved! Good to see you posting again. (PM me if need access to your old account).

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1E1HFPPE
super member


Reged: 04/19/09

Loc: Washington, DC
Re: Round Wooden Tubes? new [Re: PhotoGazer]
      #4333828 - 01/23/11 09:24 AM

Here is an article with great online calculators and an extensive set of equations.

Duckworks
http://www.duckworksmagazine.com/04/s/articles/birdsmouth/index.cfm#online-calc


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JohnH
Carpal Tunnel
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Reged: 10/04/05

Loc: Squamish BC Moved!!!!!
Re: Round Wooden Tubes? new [Re: 1E1HFPPE]
      #4334590 - 01/23/11 02:48 PM

Lee Valley's Bird's Mouth Bits come with this http://www.leevalley.com/en/shopping/Instructions.aspx?p=45202

I have helped build a spar for a boat (2 3/4" X 7" Sitka Spruce staves, seven sided form, some very small taper amounting to less than a half degree)

Edited by JohnH (01/23/11 03:44 PM)


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tim53
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Reged: 12/17/04

Loc: Highland Park, CA
Re: Round Wooden Tubes? new [Re: JohnH]
      #4334606 - 01/23/11 02:55 PM

Ooo!

I really want to try that for a tapered tube for a 3" f/15 lens I have waiting for a home!

-Tim.


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