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HELP WITH LATHE / CHUCK THREADS

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Forum topic by Imacman posted 08-31-2010 07:57 PM 4489 views 0 times favorited 31 replies Add to Favorites Watch
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Imacman

55 posts in 2288 days


08-31-2010 07:57 PM

Thanks all for the warm welcome, I haven’t had a chance to ad to my profile, so you’ll know abit about me. Basically, I’m a self employed Graphic Designer, Print, Corporate ID’s, radio, WebDesign & hosting etc. I’m in Newfoundland Canada, and I’m just about finished building a 12 X 21 Hobby workshop in my Yard…..I’ve been collecting power tools over the last 6 months in anticipation of my shop being built, I am half way finished building an Aluminum / steel CNC router ( 30 X 60 Work Area ), and I have a vertical Mill on order from Grizzly… I just bought a new ( Cheapy wood lathe ) from Ebay, So my shop is sort of going to be a wood working/ metal working do all shop… so as you can all imagine… I’ve gots lotsss to learn! and I’m sure to have lots of questions… here’s my first one…... the lathe I bought says the headstock thread is 3/4 16TPI…. so I ordered 2 3.5” chucks from Taig… that are 3/4 16TPI…one is self centering 3 jaw, the other 4 Jaw independant. The chucks cam yesterday but they don’t fit the headstock threads on the lathe ( I’m sure it’s the lathe, not the Chucks )...so…my question is… are there 2 different standards for threads of 3/4” 16 TPI? the diameter seems right, but the threads on the lathe are much more coarse than the Chucks. Any ideas or solutions for my Problem?

Thanks In advance

Paul

Newfoundland.

-- It's about the Journey....not the destination.


31 replies so far

View richgreer's profile

richgreer

4541 posts in 2537 days


#1 posted 08-31-2010 08:59 PM

The only 3/4 headstock thread that I have ever seen has 16 TPI.

You should be able to use a ruler and count to see if the lathe has 16 TPI (threads per inch).

This must be a small lathe because 3/4” is the smallest available (that I know of).

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View Knothead62's profile

Knothead62

2581 posts in 2423 days


#2 posted 08-31-2010 09:40 PM

If needed, there are adapters available from Woodcraft. I’m sure other places have them, too.

View BertFlores58's profile

BertFlores58

1684 posts in 2385 days


#3 posted 08-31-2010 11:45 PM

Check your lathe actual thread and diameter if it match to the chuck. 3/4 16tpi means 3/4 diameter with 16 thread per inch pitch (meaning) 16 turns of the chuck or nut will move 1 inch. Get the dimension also of the chuck and check if it the same. hope this will help.

-- Bert

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Imacman

55 posts in 2288 days


#4 posted 09-01-2010 12:14 AM

Hi Guys, thanks for the responses… here is a link to the actual lathe… with the specs

http://cgi.ebay.com/NEW-INDUSTRIAL-4-SPEED-1000MM-40-WOOD-TURNING-LATHE-/160469069580?pt=LH_DefaultDomain_0&hash=item255cb3af0c#ht_3239wt_873

Both The Chucks ( Taig 1030 and Taig 1050 ) have specs of 3/4” 16 TPI.. I’m pretty sure these are of course accurate , coming from Taig, so it has to be the lathe… I have a feeling that If I can’t find an adapter… I’ll have to get a machine shop to make one up…lol.. and that’ll probably cost more than I paid for the lathe and the 2 chucks combined!...lol… I will break out the micrometer and get a measurement on the lathe… I think I have a thread gauge here…but not sure it’s large enough. Thanks for the input, I will post the measurements when I have them.

Cheers
Paul

Imacman

Here’s what it says regarding the Head & tail Stock…etc

SPECS
Maximum Length Of Cutting Feed – 40 inch (1000 mm)
Max. Diameter – 14-1/4” (365 mm)
Height Of Cutting Tool – 7” (178 mm)
Motor Power – Single Phase 350 Watts
Spindle speed – 4 speeds
Turning Capacity – 356mm (14 inches) max diameter over bed. 1000mm (40 inches) max between centers
Pulley system – 4 speed V belt
Spindle speeds – 1100, 1600, 2300, 3400 rpm
Motor – 350W, 1400 rpm, AC 110V, 50/60 Hz
Construction – Headstock, tailstock, foot, tool rest base and tool rest of heavy cast iron. Bed is of heavy steel tubing.
Headstock – The drive spindle is No. 1 Morse taper and is also threaded ¾.16. The outboard end of the drive spindle can also be used for large turning and is threaded ¾.16 left hand. The pulley system and motor are mounted to the headstock.
Tailstock – Slides along the full length of bed and clamps positively at any distance from drive spindle. The ram has a hand wheel advance of 2 3/8 inches with positive lock and is fitted with a No. 1 Morse taper

-- It's about the Journey....not the destination.

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Imacman

55 posts in 2288 days


#5 posted 09-01-2010 12:40 AM

Hi all… ok I have some numbers… and a possible theory … the thread on the headstock is 3/4” in diameter and over a distance of 5/8” there are 7 thread tops… Can that tell me more?.. now here’s my theory…

I haven’t take the casing off of the unit yet… so it remains a theory…lol… here goes.. The threads that I just measured are the threads that the Dead Center screws on to… it takes two wrenches to remove the dead center… one to hold the shaft the other to loosen the center… so maybe this thread is actually screwed on over, or somehow attached to the 3/4” 16TPI thread that are stated in the specs?.. does this seem logical or make more sense? Keep i mind… this is the first lathe I’ve ever actually even seen…so.. I’m about as green as it gets. Thanks for the help… it’s appreciated.

Paul

Newfoundland

-- It's about the Journey....not the destination.

View richgreer's profile

richgreer

4541 posts in 2537 days


#6 posted 09-01-2010 01:00 AM

Please excuse me for being so direct and blunt, but this is not making sense to me.

If you see 7 threads in 5/8” that tell me that you have about 11 TPI. I’ve never heard of an 11 TPI.

Here’s my guess. You are in Canada and I have never heard of this brand. I suspect you have treads based on the metric system and any attempt to define them in Imperial measurements is just a “best guess”. You clearly do not have 16 TPI.

To be honest, I have never heard of lathe threads based on the metric system, but I expect that they exist and I suspect that is what you have.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View Imacman's profile

Imacman

55 posts in 2288 days


#7 posted 09-01-2010 01:07 AM

Yes you may well be correct Rich… I’m puzzled that the manufacturer / seller would put 3/4 16 TPI in the specs…when obvioulsy it’s not… I have a feeling my onlysolution will be A.) to have a machine shop measure accurately and tell me what they are, and see if I can find some sort of Adapter / coupler… or B.) have the machine shop make me up one…. either way… it’s kinda sucks as I’m hoping to be able to use the chucks on this lathe.

Thanks

Paul

-- It's about the Journey....not the destination.

View CharlieM1958's profile

CharlieM1958

16242 posts in 3681 days


#8 posted 09-01-2010 01:26 AM

Is your chuck close to the right size but just won’t screw on? It sounds to me like the threading is either not as advertised, or was manufactured so far out of tolerance that it’s useless.

I hate to say it, but sometimes you just have to figure that something is too good to be true. Look around at small lathes from reputable suppliers and you will find them mostly in the $250 – $350 range. At $139, I would have stayed away from this one. Good luck, though. I sincerely hope you get this worked out and prove me wrong. :-)

-- Charlie M. "Woodworking - patience = firewood"

View Imacman's profile

Imacman

55 posts in 2288 days


#9 posted 09-01-2010 02:09 AM

Thanks Charlie… I think it’s more like Rich said in his post…. it’s either metric or more likely someone eyeballed it and maybe even counted the crests and the troughs of the screw threads… that would come up to about 16 TPI…lol.\
It’s not a poor tolerance machined screw issue… it’s simply Not 16 TPI… If I can find an adapter or have one made up it will be great… if not, I can use it to learn on until I see more short comings etc, But even as it is I’m very happy with it.

I bought it as something, inexpensive to learn on.. I have tried it out, and I’m very happy with it ( for what I know ), I Plan on building one as a DIY project over the winter, so My new chucks won’t be wasted. I recently took apart a perfectly good Treadmill with a digital speed controller and high torque motor…. I also bought a Torque master Pulley online, and a load of 8020 aluminum… and finally a Taig Compound slide, so it will make an interesting build project for sure.

Cheers Paul
Newfoundland

-- It's about the Journey....not the destination.

View Padre's profile

Padre

930 posts in 2951 days


#10 posted 09-01-2010 02:23 AM

Are the lathes made ‘across the pond’ done in metric or imperial?

-- Chip -----------http://www.penmanchip.com-----------------Micah 6:8

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Imacman

55 posts in 2288 days


#11 posted 09-01-2010 02:49 AM

lol… I’m not sure Padre… I’m in Canada… and although canada is suppose to be “Metric”.. pretty much all of the tools and accessories sold up here are Imperial measures… not all though.

Paul

Newfoundland, Canada

-- It's about the Journey....not the destination.

View CharlieM1958's profile

CharlieM1958

16242 posts in 3681 days


#12 posted 09-01-2010 03:52 AM

Paul, I agree with your approach of buying a relatively cheap lathe to learn on. I did the same thing a while back, purchasing this one from Rockler. It works quite well, but I’m already starting to wish it had a little more power. Turning is quite addictive. And you will soon find yourself spending far more on tools and accessories than you did on the lathe. Have fun!

-- Charlie M. "Woodworking - patience = firewood"

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Imacman

55 posts in 2288 days


#13 posted 09-01-2010 04:03 AM

Of that I have no doubt Charlie… I have a nice set of hand chisels… my first project when the shop is finished is to make a set of longer handles for them ( they are the short type, not suited for lathe work ) but the blades are great. When my Mill arrives in Sept I plan on making my own blades as well…. I like the whole concept of making my own tools.

Cheers

Paul

-- It's about the Journey....not the destination.

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Imacman

55 posts in 2288 days


#14 posted 09-02-2010 04:29 PM

The Mystery is solved…. Thanks to Raymond,... he sent me a message this morning… this is the same economy lathe that harbour freight sells in the US, under the Central Machine brand, I downloaded the manual for it, and Yup… it’s identical…. and the actual specs on the headstock are 10TPI… so now at least I know what I’m looking for…. I need a 3/4” adapter / coupler with female 10TPI and male 16TPI, anyone know if such an animal exists, or is it off to the machine shop for me?

Thanks

Paul

Newfoundland

-- It's about the Journey....not the destination.

View Raymond's profile

Raymond

676 posts in 3190 days


#15 posted 09-02-2010 06:34 PM

Humm did a google search on that. And that is going to be a hard find.

Check out http://www.pennstateind.com/store/spindle-adapters.html

They have a 3/4 10TPI adapter, there still would need to be a bushing made, but it might work.

-- Ray

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