WWA Info Exchange

For Woodworkers By Woodworkers
It is currently Mon Nov 20, 2017 2:31 am

All times are UTC - 5 hours




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: Longworth chuck
PostPosted: Sun Apr 14, 2013 9:55 am 
Offline
Veteran

Joined: Sat Aug 21, 2010 8:46 pm
Posts: 278
Location: Hamilton, MS
Finally made me a longworth chuck. Works great, but it is a pain to adjust. With the bolt hold downs installed, even loose, it a time consuming task to adjust.[img]
Image
Image
Image[/img]


Top
 Profile  
 
 Post subject:
PostPosted: Sun Apr 14, 2013 10:35 am 
Offline
Veteran
User avatar

Joined: Sat Jan 14, 2006 10:44 am
Posts: 3842
Location: Skagit Co WA
That's been on my to-do list for ages. Bet it comes in handy!

_________________
Nullum Gratuitum Prandium

Cheers - Dennis


Top
 Profile  
 
 Post subject:
PostPosted: Thu Apr 18, 2013 8:28 pm 
Offline
Veteran
User avatar

Joined: Thu Mar 14, 2002 1:01 am
Posts: 1233
Location: Cape Cod Massachusetts
Nice chuck, I can understand the PITA factor.

I have Cole Jaws for my Nova chucks that basically do the same thing on a smaller scale.

But......

Once you use a vacuum chuck you will never mess with a longworth or a gripping type chuck again for reverse turning.

A vacuum system is well worth the $$ but don't buy it from a retailer (way too much)

I built mine with hardware store fittings and a surplus Vac pump from Surplus Center.

My system cost me about $150.


Good Luck,
---Nailer---

_________________
No regrets, just some interesting results.
email: nailed_nailer@yahoo.com


Top
 Profile  
 
 Post subject:
PostPosted: Wed May 29, 2013 8:56 pm 
Offline
Veteran
User avatar

Joined: Mon Apr 11, 2005 12:01 am
Posts: 4734
Location: Seattle, WA, USA
Hey MM,

I don't generally consider myself to be a turner, so my perception may be wrong but, The way I understood a Longworth chuck to work was that the spirals of the two plates were set up to rotate in opposite directions so that the piece self centers. By counter rotating in one direction, you close the chuck, and by counter rotating in the other you open it. So what is the adjustment hassle?

Tom

_________________
"There is no path to peace, peace is the path."
Mohandas K. Ghandi
Image


Top
 Profile  
 
 Post subject:
PostPosted: Thu May 30, 2013 10:35 am 
Offline
Veteran
User avatar

Joined: Sat Jan 14, 2006 10:44 am
Posts: 3842
Location: Skagit Co WA
You've got the principle correct, Tom. But realize you've got four (or more) bolts sliding against two pieces of plywood, in this case, so there's quite a bit of friction. I have some solid surface countertop material (Corian like stuff) that I plan on using for mine (someday), which if the spiral slots are well machined and polished should make adjustment a bit easier.

_________________
Nullum Gratuitum Prandium

Cheers - Dennis


Top
 Profile  
 
 Post subject:
PostPosted: Thu May 30, 2013 5:37 pm 
Offline
Veteran
User avatar

Joined: Tue May 28, 2013 2:55 pm
Posts: 5
Location: Mount Vernon, WA
I made one with 3/4" ply a few months ago. I sanded the slots well, but the threads on the bolts still cause a bit of drag. A work around would be to put sections of 7mm pen tubes over the 1/4" bolt shafts, but the slots would need to be enlarged to accommodate pen blanks. That would require a slightly oversize router bit to cut the slots.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group