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Selecting the Right Nova Jaws for Longworth Chuck (Read 553 times)
 
Mike Turner
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Selecting the Right Nova Jaws for Longworth Chuck
Jan 16th, 2017 at 4:02pm
 
I just purchased a Longworth chuck for my Jet 1642..The disk on the back of it is 3". The 2 sets of chuck jaws I have for my Nova G3 and Nova Sn2 are max 2 1/2" and the other the minimum is 3"..  I need to be able to tighten down to 3" Hmmmmm  which jaws do I need?
It wouldnt make any difference if I switched the 2 1/2" from the G3  and put it on the Sn2 would it?
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« Last Edit: Jan 16th, 2017 at 4:07pm by Mike Turner »  
 
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Mike Mills
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #1 - Jan 16th, 2017 at 5:22pm
 
I believe the amount the jaws scroll out are the same for the G3 and the SN2.
Probably the 70mm jaws would be best but check the spec sheet.  The 75mm bowl jaws have about the same spigot as the 50mm so that is no help and the 100mm would be too large.

I went out and checked mine but they are mounted on an SN not an SN2.  For a spigot absolute min is 56mm and max 84mm.  I'm not sure if my SN2's have the same amount of movement or not.  You can check the movement on your SN2 as a comparison.
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« Last Edit: Jan 16th, 2017 at 5:51pm by Mike Mills »  

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Ed Weber
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #2 - Jan 16th, 2017 at 6:27pm
 
While the description from the Teknatool page is IMO pathetic. Roll Eyes
"These extremely versatile jaws are a bigger version of the standard 50mm (2") Jaws.  They are particularly suitable for larger work, including hollow forms."
The 70mm jaw set is most likely the one you're after.
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Mike Mills
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #3 - Jan 16th, 2017 at 6:37pm
 
I also remember this from Stuart Ablett (his pic is attached) and it works fine.  He used cutting board and this pic is before the kerf was cut.  I thought he had a youtube video but I could not find it (Stu in Toyoko)
If you have the 100mm jaws mount a small piece of good hardwood on your G3 with the wormscrew. 
Turn down to a tight fit for your 100mm jaws fully open.
Mount in your 100mm jaws and hollow the interior to your desired diameter.
Remove and cut a kerf for compression.

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« Last Edit: Jan 16th, 2017 at 6:38pm by Mike Mills »  

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Mike Turner
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #4 - Apr 20th, 2017 at 4:35am
 
The 70mm wont quite open far enough..If it opened a 1/32" more it would be good...I guess machine shop or maybe something like Stu did.....
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Ed Weber
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #5 - Apr 20th, 2017 at 8:29am
 
Mike Turner wrote on Jan 16th, 2017 at 4:02pm:
I just purchased a Longworth chuck for my Jet 1642..The disk on the back of it is 3"


I don't know what chuck you purchased but having to deal with a tool that won't properly fit "standard" jaw sizes is ridiculous.
I would contact them and/or return it if I could.
Unfortunately, you'll most likely have to create a solution for your yourself.
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Ken Vaughan
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #6 - Apr 20th, 2017 at 10:45am
 

Mike

Which one did get?   I looked at Amazon and that one is 2 1/4.  Rockler appears to sell Ron Brown's version and it is specifically says it is sized to fit Nova Jaws.  (The clue is they are showing Ron's video).

One of the CNC router owners here makes them, but the back end needs to be handled like a machinist chuck and the backplate fitted to the lathe.

Talk to the vendor as there may be one that slipped by the quality assurance inspector with out the back being completed.

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Mike Turner
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #7 - Apr 20th, 2017 at 4:00pm
 
I got mine from a guy on ebay  He offered to swap out the part on his 14" Longworth chuck but said it was smaller so I thought i could get it resolved easier than this The link says 10" but he makes whatever size you need..

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Mike Turner
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #8 - Apr 20th, 2017 at 5:29pm
 
Ed Weber wrote on Apr 20th, 2017 at 8:29am:
I don't know what chuck you purchased but having to deal with a tool that won't properly fit "standard" jaw sizes is ridiculous.

I totally agree Ed...I know I have let  this sit on the backburner and returning it is probably out of the ? Didnt think this would turn out like this.
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Ken Vaughan
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #9 - Apr 20th, 2017 at 5:45pm
 
Mike Turner wrote on Apr 20th, 2017 at 5:29pm:
Ed Weber wrote on Apr 20th, 2017 at 8:29am:
I don't know what chuck you purchased but having to deal with a tool that won't properly fit "standard" jaw sizes is ridiculous.

I totally agree Ed...I know I have let  this sit on the backburner and returning it is probably out of the ? Didnt think this would turn out like this.
   



Mike, since you appear to be short of recourses, a disassembly, mounting between centers, and turning the back to fit the chuck (aka fitting the back plate) is one option.  Turning a block and providing jaw anchor, increasing to the existing disc and attaching with epoxy and screws is another technique possible.

I never seem to get the add on to match perfect, but some can do it.
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Jeff Vanden Boogart
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #10 - Apr 20th, 2017 at 9:48pm
 
Mike, if the "disc" is a separate piece that can be removed, have your local machinist buddy turn it to fit your chuck.  I'll do it if you want to cover the shipping.  I modified mine, diameter and added dovetail, to fit the chuck jaws "exactly".
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Mike Turner
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #11 - Apr 21st, 2017 at 3:07am
 
Thanks everybody for your help.There is a local machinist that can do it if I go that route(probably) To me it looks like the back "disc" could be thicker/beefier too.Im off next week so Ill see what I can come up with.  Thanks again!!!

The disc is aluminum .I know it is softer...Can I turn a little off with woodturning tools??? Dont need to remove much and think Ill add a piece of something for more thickness if I can find something .
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« Last Edit: Apr 21st, 2017 at 3:13am by Mike Turner »  
 
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Ed Weber
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Re: Selecting the Right Nova Jaws for Longworth Chuck
Reply #12 - Apr 21st, 2017 at 8:14am
 
You can usually turn aluminum with standard turning tools.
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