Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> ATM, Optics and DIY Forum

Pages: 1
scott50
member
*****

Reged: 08/18/08

Loc: New York
Source for plywood circles new
      #5948202 - 06/30/13 03:05 PM

I don't have access to a router and have cut many plywood rings and circles for Dobsonian scopes using a hand saber saw. For me, it was a pain. They never came out perfect and required a lot of sanding. Not a big deal for the cage rings but more critical for side bearings. I just found a GREAT, INEXPENSIVE source for plywood circles: http://www.readytocover.com/round-table-tops-wood-table-top-unfinished.html

For my 17.5" project I ordered a 30" table top for the side bearings, which they cut into two perfect semi-circles at no extra charge. I also bought a 25" table top for my ground board. I'm going to lighten the side bearings by cutting out some unnecessary wood, but I won't have to do anything to the edge. The company "Ready to Cover" was very helpful, shipping was free & speedy, the quality of the 3/4" plywood was first-rate, and their prices were very inexpensive. For a modest fee, I saved a lot of frustration. I'll post pics in the coming month as my scope gets fleshed out.


Post Extras: Print Post   Remind Me!   Notify Moderator  
PaulEK
sage
*****

Reged: 05/25/08

Loc: Wisconsin
Re: Source for plywood circles new [Re: scott50]
      #5948513 - 06/30/13 07:07 PM

It's great that they have such a wide, full spread of sizes; 12-48 inches in one-inch increments. I do have access to a router, and I find these tempting!

Thanks for this; it's bookmarked for me!


Post Extras: Print Post   Remind Me!   Notify Moderator  
cpr1
professor emeritus
*****

Reged: 03/24/12

Loc: Louisiana
Re: Source for plywood circles new [Re: PaulEK]
      #5948529 - 06/30/13 07:17 PM

That is a interesting site for plywood circles. Little high considering the price of a 5x5 sheet of finnish birch. But if you don't have the router and circle jig I can see that it would be a great option. What is the shipping like?

Are you planning a traditional truss with a full sized mirror box? If so are you going to use 3/4 or 1 inch bearings?


Post Extras: Print Post   Remind Me!   Notify Moderator  
gaz-in
scholastic sledgehammer
*****

Reged: 12/17/07

Re: Source for plywood circles new [Re: cpr1]
      #5948760 - 06/30/13 09:53 PM

"What is the shipping like?"

Site says free shipping...

Thanks OP...I think the price is inexpensive also...plan to order for my next DOB project...Thanks again for posting....

Edited by gaz-in (06/30/13 09:56 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
cpr1
professor emeritus
*****

Reged: 03/24/12

Loc: Louisiana
Re: Source for plywood circles new [Re: gaz-in]
      #5948778 - 06/30/13 10:08 PM

oops, I did not see that I was just looking at the price. Cool.

Post Extras: Print Post   Remind Me!   Notify Moderator  
HunterofPhotons
Pooh-Bah


Reged: 04/26/08

Loc: Rhode Island, USA
Re: Source for plywood circles new [Re: scott50]
      #5949532 - 07/01/13 12:02 PM

A 1/4" trim router can be had for $30.
A carbide bit will cost $10-$20.
A scrap of plywood and ten minutes work will produce an adjustable circle cutting jig.
It's the old "Give a man a fish..." philosophy. <g>

dan k.


Post Extras: Print Post   Remind Me!   Notify Moderator  
davidpitre
Post Laureate
*****

Reged: 05/10/05

Loc: Central Texas
Re: Source for plywood circles new [Re: HunterofPhotons]
      #5950131 - 07/01/13 06:26 PM

Anyone know of someone who will cut and ship routed Birch custom UTA circles?

Post Extras: Print Post   Remind Me!   Notify Moderator  
gaz-in
scholastic sledgehammer
*****

Reged: 12/17/07

Re: Source for plywood circles new [Re: davidpitre]
      #5950276 - 07/01/13 08:02 PM

Quote:

Anyone know of someone who will cut and ship routed Birch custom UTA circles?




I believe Dennis from Dobstuff will...


Post Extras: Print Post   Remind Me!   Notify Moderator  
Chuck Hards
Post Laureate
*****

Reged: 05/03/10

Loc: The Great Basin
Re: Source for plywood circles new [Re: gaz-in]
      #5950867 - 07/02/13 07:56 AM

When I first read the title of this thread, I thought "you have to find a plywood tree of just the right diameter".

Sorry, I'm a patternmaker. Wise-cracking pertaining to the job runs deep.


Post Extras: Print Post   Remind Me!   Notify Moderator  
careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Source for plywood circles new [Re: HunterofPhotons]
      #5950955 - 07/02/13 09:21 AM

Quote:

A 1/4" trim router can be had for $30.
A carbide bit will cost $10-$20.
A scrap of plywood and ten minutes work will produce an adjustable circle cutting jig.
It's the old "Give a man a fish..." philosophy. <g>

dan k.




To be fair I would also add some other costs to that - a good book on router safety and usage to start with, ~$17 on Amazon. A trim router is not a 2 hp beast, but cutting large disks of 3/4" plywood is still a big cutting job, and the cheap trim router will have only one speed (high - 30,000 RPM) and no soft start. When working with an exposed cutter like this being grounded in all the proper handling and safety practices is essential.

And there will likely be incidental expenses - e.g. a box of special screws to attach said trim router base to plywood scrap (the screws with the router base are probably not long enough), so throw in a total of another $20 on top of the router and bit.

Then he needs a work table where the large volumes of sawdust emitted by said router will not cause a problem - some have that, some don't.

Then you can assume one of two pieces of wasted material while getting the skills together to do it successfully, and the time.

If you will only need a couple of disks and you know and can order the exact sizes, then ordering them is likely the wiser choice.

Get a router if your longer term plans are more ambitious.


Post Extras: Print Post   Remind Me!   Notify Moderator  
derangedhermit
Pooh-Bah


Reged: 10/07/09

Loc: USA
Re: Source for plywood circles new [Re: cpr1]
      #5951960 - 07/02/13 07:36 PM

Quote:

That is a interesting site for plywood circles. Little high considering the price of a 5x5 sheet of finnish birch.



The site does not say it is Baltic birch, just birch.


Post Extras: Print Post   Remind Me!   Notify Moderator  
derangedhermit
Pooh-Bah


Reged: 10/07/09

Loc: USA
Re: Source for plywood circles new [Re: derangedhermit]
      #5952129 - 07/02/13 09:31 PM

Astrogoods/1stbase offers custom CNC baltic birch work. I haven't done business with them. I kinda like the looks of the small dob base kits.

It might help if someone could figure out a set of "stock" dimensions for rings so it wouldn't be such a huge waste of plywood and someone could carry rings as stock parts.


Post Extras: Print Post   Remind Me!   Notify Moderator  
John Carruthers
Skiprat
*****

Reged: 02/02/07

Loc: Kent, UK
Re: Source for plywood circles [Re: Chuck Hards]
      #5952497 - 07/03/13 03:46 AM


Quote:

"you have to find a plywood tree of just the right diameter".





Post Extras: Print Post   Remind Me!   Notify Moderator  
davidpitre
Post Laureate
*****

Reged: 05/10/05

Loc: Central Texas
Re: Source for plywood circles new [Re: derangedhermit]
      #5954451 - 07/04/13 08:31 AM

Quote:

Astrogoods/1stbase offers custom CNC baltic birch work. I haven't done business with them. I kinda like the looks of the small dob base kits.

It might help if someone could figure out a set of "stock" dimensions for rings so it wouldn't be such a huge waste of plywood and someone could carry rings as stock parts.



I had a dob mount made by them. It was poor quality, a poor design, hardly sealed at all,and non functional until I put a lot of work in to it.


Post Extras: Print Post   Remind Me!   Notify Moderator  
derangedhermit
Pooh-Bah


Reged: 10/07/09

Loc: USA
Re: Source for plywood circles new [Re: davidpitre]
      #5955749 - 07/05/13 09:27 AM

David, I'm sorry to hear that, but I guess it's good to know.
- Lee


Post Extras: Print Post   Remind Me!   Notify Moderator  
scott50
member
*****

Reged: 08/18/08

Loc: New York
Re: Source for plywood circles new [Re: gaz-in]
      #5957732 - 07/06/13 03:21 PM

I received the circles in NY within 3 days. Great service

Post Extras: Print Post   Remind Me!   Notify Moderator  
kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: Source for plywood circles new [Re: gaz-in]
      #5957744 - 07/06/13 03:34 PM

Quote:

Quote:

Anyone know of someone who will cut and ship routed Birch custom UTA circles?




I can get aluminum rings water jet cut should not be much


Post Extras: Print Post   Remind Me!   Notify Moderator  
kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: Source for plywood circles new [Re: kfrederick]
      #5957749 - 07/06/13 03:37 PM

What size ?

Post Extras: Print Post   Remind Me!   Notify Moderator  
calypsob
sage
*****

Reged: 04/20/13

Re: Source for plywood circles new [Re: kfrederick]
      #5966606 - 07/11/13 11:57 PM

Yah know this is kind of crazy but I found out a few years ago that you can cut perfect circles on a table saw, big circles, at that. http://www.youtube.com/watch?v=23kkZZN1ACs

Post Extras: Print Post   Remind Me!   Notify Moderator  
StarStuff1
Post Laureate
*****

Reged: 04/01/07

Loc: South of the Mason-Dixon Line
Re: Source for plywood circles new [Re: calypsob]
      #5966637 - 07/12/13 12:18 AM Attachment (12 downloads)

Been doin' that for years. Makes a lot of sawdust but works great. For some reason I prefer the table saw to a router for large discs of plywood.

Here is just one made 7 years ago to be a center tray/eyepiece holder for a tripod.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1


Extra information
1 registered and 18 anonymous users are browsing this forum.

Moderator:  ausastronomer, richard7, Starman81 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 1285

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics