LumberJocks

4 Jaw Chuck Help

  • Advertise with us

« back to Woodturning forum

Forum topic by Sbaldewicz posted 07-04-2013 09:40 PM 1633 views 0 times favorited 14 replies Add to Favorites Watch
View Sbaldewicz's profile

Sbaldewicz

2 posts in 445 days


07-04-2013 09:40 PM

Topic tags/keywords: 4 jaw chuck chuck help question lathe

This is my first post I recently purchased my first lathe lot from a yard sale (a bunch of tools 15-20, an 1/2 HP Craftsmen lathe, and a 3/4 HP Duracraft lathe, craftsmen bowl rest, 2 face plates and a 4 jaw chuck). I made out very well at an estate sale in which they just wanted a bunch of tools gone. Needless to say I’m a novice and that’s being generous, I’ve made some rolling pins, captive rings/ rings, a few “magic wands”, nothing spectacular but i’m learning.

I am not sure if I am doing something wrong, or if there is an issue with the chuck (I believe it to be on my end) When it comes to centering the blank on the chuck. I have tried to find a video on youtube on how to center a 4 jaw chuck, but they all seem to be on how to use a self centering chuck. I plan to someday purchase a newer lathe and at that point would upgrade to a better chuck. However for right now I am really eager to try turning something with the chuck.

If there are any tips/ tricks or links that could help me please let me know!

Thanks a bunch! Sandy


14 replies so far

View JustJoe's profile

JustJoe

1554 posts in 695 days


#1 posted 07-04-2013 10:14 PM

http://littlemachineshop.com/Reference/Centering4-JawChuck.pdf

Most woodworking 4-jaws are self-centering If yours isn’t, it might be for metalworking in which case it’s probably a heavier chunk of metal than your lathe needs to be turning, with jaws that aren’t made for gripping wood. But if it is indeed a woodworking chuck, or you’re determined to use it even if its for metal, then the pdf in the link above should get you going.

-- This Ad Space For Sale! Your Ad Here! Reach a targeted audience! Affordable Rates, easy financing! Contact an ad represenative today at JustJoe's Advertising Consortium.

View Sbaldewicz's profile

Sbaldewicz

2 posts in 445 days


#2 posted 07-05-2013 12:02 AM

It is for wood it came with my lathe that was new in about 1955 give or take a few years. Thank you for the PDF!

View Wildwood's profile

Wildwood

1040 posts in 791 days


#3 posted 07-05-2013 11:11 AM

This will work on spindle or bowl blanks except might have to turn a recess or tenon on bowl blank between centers first. . Mark center in one end of wood (draw an X) take an awl and make a hole in center of X. Place wood in chuck loosely bring up tailstock and put live center point in hole, then tighten chuck.

We have posted this video here before but might help you/
http://www.youtube.com/watch?feature=player_detailpage&v=aUXil-5dEeo

-- Bill

View bondogaposis's profile

bondogaposis

2528 posts in 1008 days


#4 posted 07-05-2013 11:51 AM

Generally you turn a tenon on one end between centers, then put on the 4 jaw chuck and insert the tenon into it. Everything should be centered at that point.

-- Bondo Gaposis

View justinwdemoss's profile

justinwdemoss

146 posts in 1552 days


#5 posted 07-05-2013 03:43 PM

I would think about a self-centering chuck. Check out your head stock size and threads. Buy a smaller chuck like a Nova G3 for around $125. Get the threaded insert that fits your lathe. Then, when you upgrade lathes, if you do, you only have to get a new threaded insert ($20-25).

-- Justin in Loveland, OH

View Rick M.'s profile

Rick M.

3977 posts in 1037 days


#6 posted 07-05-2013 06:23 PM

It is for wood it came with my lathe that was new in about 1955

I don’t believe they made 4 jaw chucks for wood back then. It’s almost certainly a metal lathe chuck.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View mpsprunger's profile

mpsprunger

11 posts in 518 days


#7 posted 07-05-2013 07:23 PM

Grizzly makes a three jaw chuck that is very nice

View Wildwood's profile

Wildwood

1040 posts in 791 days


#8 posted 07-05-2013 07:33 PM

Grizzly once sold a big heavy version of this chuck with revisable jaws. Jaws were flat on both sides. If have old style or this current style buy a new chuck. Both are knuckle busters you can really compress wood when tightening. 3-jaw chucks not really safe for woodturning!

http://www.grizzly.com/products/3-4-Jaw-Chuck-1-x-8-TPI/H7605

Even though jaws and chuck body numbered have to make sure jaws go back into same slots when reversing jaws or will not close all the way.

If have one of these or similar scroll chucks, procedure outlined above will work. A lot of turners just eye ball it but I still draw the X and make hole with awl so live center has a place to go.

http://www.grizzly.com/products/4-Jaw-Wood-Chuck-3-4-x-16-TPI/H6264

Self centering does not always mean wood will be perfectly centered once jaws are tighten even if turn a tenon or recess for jaws. Wood not made perfectly machined from birth. When mounting wood on a lathe whether turning between centers with spur drive or chuck in or on headstock and live center in tailstock get wood as close as you can then turn it perfectly round!

-- Bill

View Kenbu's profile

Kenbu

18 posts in 537 days


#9 posted 07-05-2013 08:14 PM

If it’s non-self-centering, like this: http://www.grizzly.com/products/6-4-Jaw-Wood-Chuck-1-x-8-TPI/H8049, then Wildwood’s method should work, adjusting the jaws individually.

Ken

View Wildwood's profile

Wildwood

1040 posts in 791 days


#10 posted 07-06-2013 10:20 PM

Sandy, if you are using a 4-jaw independent adjustable jaw chuck, might be easier to install spindle or bowl blank in the chuck off the lathe where can see jaws better. Whether hold outside of wood (compression) or fit into a recess (expansion) adjust jaws close to actual size of the blank. Then snug up jaws moving in or out depending upon method need to hold blank. Then mount on lathe and bring up tailstock for support and tighten down wood in chuck.

Only word of caution unless end of blank is perfectly square make sure wood is not touching chuck body face.

-- Bill

View Jim Jakosh's profile

Jim Jakosh

11483 posts in 1762 days


#11 posted 07-19-2013 01:59 AM

4 jaw independent chucks are used a lot in metal working where you mount a piece in it and then use a precision indicator to get it perfectly concentric with a hole of feature in the piece.I have one that is made to be used on the wood lathe and it never has gotten out of the drawer, but it could be used to do some neat eccentric work. The best ways to use it is to mark the center on a piece of wood and poke a hole in with an awl. then back all the jaws away so they don’t contact the piece and put the block in the 4 jaw chuck and bring up the tail stock with live center in it and drive the cent in the awl mark and hold pressure on it while you bring up each of the jaws to the edges of the piece and clamp them down. then you can turn you piece and it should be center on the mark you laid out.

I’d suggest a 4 jaw scroll chuck with angled jaws for wood working. But, don’t get a chuck that used two pins to tighten it- get one that uses a T handle so you have one hand free when loading it. It makes it a Whole lot easier.
Here is the model # for a Grizzly 3 3/4” chuck for wood and for a 1”-8 spindle: H6265. Once you buy it and you need to use it on a different threaded spindle, call the technical department for the part number of that back bushing and you can get one for about $14. You will not be disappointed!!!!!!!!!!
I have a 1”-8, a 3/4”-16 and 1 1/2” -8 bushings. I can turn a piece on one lathe, leave it in the chuck, switch the bushing and mount it on another lathe and it is right on.

...............Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View woodman44's profile

woodman44

38 posts in 1347 days


#12 posted 07-23-2013 12:04 AM

My situation is similar to Sandy’s in that I got a Dunlap/Sears vintage 1940’s lathe model 101.06242 with a bunch older tools. I have never done any turning so I joined my local turning club to get educated on turning.

The chuck I have now is for metal turning. My spindle is 3/4, 16tpi, the max. blank diameter is 9”. I was all set to order a Grizzly chuck until a club member recommended not getting a Grizzly. Since I want to keep my investment down until I get serious about turning, can someone recommend a good quality chuck new or used that will work for turning bowls, spindles and pens?

Thanks in advance for your suggestions,
Ken

-- Ken, Michigan

View BalloonGuy's profile

BalloonGuy

93 posts in 580 days


#13 posted 07-23-2013 03:17 AM

Check the factory-reconditioned products at Teknatools. I purchased a refurbished SuperNova2 for about $90 below list, and it’s good as new.

-- Tom Peterson, Omaha, NE

View Bill White's profile

Bill White

3455 posts in 2617 days


#14 posted 07-23-2013 01:33 PM

I have the Grizz VicMarc clone on my lathe. It has been quite good for the money.
Bill

-- bill@magraphics.us

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase