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Lathe Problem

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Blog entry by pete57 posted 1715 days ago 1525 reads 0 times favorited 11 comments Add to Favorites Watch

I bought a new Jet VS 1220 with the extension and built a nice stand. The machine itself is not vibrating, but the live center seems to be loose. It is Brand new!!! I have made 5 turnings and they were weird, but when I started on the stretchers for my personal Windsor it just would not get smooth. The bird beeks on the center stretcher were fine until I tried to sweeten them up, then they were broken off in places. I have all brand new sorby and packard tools that have been sharpened by my chair mentor.

Anyone have this same problem with the Jet Mini 1220 live center??

Can anyone think of anything that might be wrong?

I have a new oneway live center on order and will be getting a new stebcenter for Christmas.

-- Humble Wood Servant



11 comments so far

View Bob Kollman's profile

Bob Kollman

1796 posts in 1790 days


#1 posted 1715 days ago

Hi Pete,

Well I turn on cnc for a living so these are the procedures I would follow: 1) You say the live center seems to be loose. Take your hand and see if you can move the center up or down, right or left. If you can see it move the live center is bad. 2) If you have an indicator, the center should turn .001 or better. 3) If you are
using an extention on your lathe make sure that it is aligned prorperly. 4) Make sure you are concentric between the chuck and the center. Once more you will need an indicator. Find a nice round shaft that is strait and round, indicate at the chuck and the tail, you should not be out more than .003 thousands of an inch over a 2 to 3 foot length. Also make sure everything is tight and secure. When turning your part must be extremely ridgid and secure, and your tool must be ridgid, keep everything thight, close, and ridgid.
I hope this will be usefull to you.

Bob

-- Bob Kenosha Wi.

View pete57's profile

pete57

134 posts in 2010 days


#2 posted 1715 days ago

Bob,
What is cnc?
My neighbor is a machinist and he helped me set up the lathe. I do not have an indicator (What kind do I need and where do I get one) but we did a test to see if the centers came together and this was perfect. I did not see if he used a indicator I will have to ask. He set itup and measured for a tool rest that is 24” out of stainless. I purchased another tool rest holder from Jet and this helps with legs, stretchers, arm stumps, and stiles so I don’t have to move it so much.

When the lathe is running the live center feels out of round when I touch it with my finger. I have turned several things and my mentors shop with his lathe and his center does not do that. He has a Oneway and a big Delta though.

I was wondering also if there is anyone that had the live center problem with their Jet Mini Lathe. I just think that it is terrible for a person to pay for a lathe and can’t turn quality chair parts when it is right out of the box. I have had it since last June and just set it up a month ago. Turned probably 7 legs and a couple sets of stretchers. It keeps getting worse the more I use it.

Will these indicators be useful on other machines?

-- Humble Wood Servant

View pete57's profile

pete57

134 posts in 2010 days


#3 posted 1715 days ago

Bob,
What is cnc?
My neighbor is a machinist and he helped me set up the lathe. I do not have an indicator (What kind do I need and where do I get one) but we did a test to see if the centers came together and this was perfect. I did not see if he used a indicator I will have to ask. He set itup and measured for a tool rest that is 24” out of stainless. I purchased another tool rest holder from Jet and this helps with legs, stretchers, arm stumps, and stiles so I don’t have to move it so much.

When the lathe is running the live center feels out of round when I touch it with my finger. I have turned several things and my mentors shop with his lathe and his center does not do that. He has a Oneway and a big Delta though.

I was wondering also if there is anyone that had the live center problem with their Jet Mini Lathe. I just think that it is terrible for a person to pay for a lathe and can’t turn quality chair parts when it is right out of the box. I have had it since last June and just set it up a month ago. Turned probably 7 legs and a couple sets of stretchers. It keeps getting worse the more I use it.

Will these indicators be useful on other machines?

-- Humble Wood Servant

View Bob Kollman's profile

Bob Kollman

1796 posts in 1790 days


#4 posted 1715 days ago

Pete,

If you can feel the center is out of round then that would be a good indication of where your problem lies. It should feel perfect like your freinds. An indicator is a measureing insturment that measures in thousands of an inch. It has a needle that you can put on your tail stock, and you can read the dial as you spin the live center it will tell you how true or how out of round your tail stock is running. CNC, stands for computer numerical control, another words my lathe has a computer connected to it and the computer tells the lathe what pattern to make, i.e. I program it.

A dial indicator with magnetic base would probably meet your needs. Rockler, woodcraft or MSC would be a good place to buy one.

If the live center has a wobble to it it is bad and unsafe. The live center should always turn true. If you purchased the lathe from rockler, or wood craft, I would go to the store, or contact them by phone if you bought it on line. Usually, the people at rockler or woodcraft are very knowledgable and will assist you in getting a new tailstock. Otherwise, contact the manufacturer Jet, and hopefully they will be able to help you solve the problem. Jet CPO can sometimes be a problem to deal with.

Large lathes use a morse taper to hold the live center, if your live center is held with a morse taper you should have a triangler shaped knock out tool to remove the live center from the tail stock, remove the live center and make sure it is prefectly clean and that there is no dent, dings, or imperfections that would cause the center to tilted out of alignment. Some lathes have a crank handle at the end of the tail stock and you simply remove the center by cranking the wheel all the way over until the live center just pops out, once more check to make sure the holder is perfect, no dings or imperfections.

Last, your tail stock must be in a direct line with your chuck, it is possible, but not probable that the casting on your lathe, or the table is twisted and out of alingment, that is remote but possible, this would mean you need a new lathe.

Bob

-- Bob Kenosha Wi.

View pete57's profile

pete57

134 posts in 2010 days


#5 posted 1715 days ago

Thanks Bob.
I bought the lathe through a friend that saved me some money, enought to get an 8” VS delta grinder. I had to wait on the lathe after I bought it. It was suppose to be a week and ended up being 3 months. We are still great friends but he is now managing a Woodcraft in Baltimore MD. I will talk to him next week and see what he thinks on what I need to do with Cayce Co. and then I will call them. I might can get a credit and use it towards a new Henry Taylor 1 1/2 roughing gouge!!!!

-- Humble Wood Servant

View Broda's profile

Broda

313 posts in 2118 days


#6 posted 1714 days ago

if you can, borrow a friends centres and see if the do the same thing.
if they dont then you might have some faulty centres. cheap(ish) fix.

-- BRODY. NSW AUSTRALIA -arguments with turnings are rarely productive-

View StevenAntonucci's profile

StevenAntonucci

355 posts in 2537 days


#7 posted 1714 days ago

I seriously doubt the center is bad. While it is always possible, I would look at the tailstock quill first to make sure that the taper is clean and the center is properly seated. You can put it in the headstock and turn the lathe on to see if it runs true. (I suspect it will). Some tailstocks are self ejecting, which might be your issue- run the tailstock out about half way before you seat the taper and see if the problem goes away.

-- Steven

View Bob #2's profile

Bob #2

3808 posts in 2620 days


#8 posted 1714 days ago

I’m thinking you need a steady rest on that stretcher. Often the pressure of the cutting tool will push it out of centric and the part will begin to chip and flake.
If your tail stock and your head stock line up with each other then it’s unlikely the live center is at fault.

Still difficult without actually seeing what you are describing.
Try to get a camera going.

Bob

-- A mind, like a home, is furnished by its owner

View Hix's profile

Hix

161 posts in 1877 days


#9 posted 1714 days ago

sometimes it is something simple…..the tailstock is self ejecting on the live center. be sure the tail stock is extended a little bit so that the taper on the live center can be fully seated. You can feel it when it starts to eject the live center so you should be just a little bit before that.

-- ---call me---- Mark

View papadan's profile

papadan

1116 posts in 1967 days


#10 posted 1714 days ago

Checking the center alignment to each other is correct, but is it still aligned when the tail stock is on the extention. Also try removing and cleaning the centers Morse taper and reseat it.

-- Carpenter assembles with hands, Designer builds with brains, Artist creates with heart!

View pete57's profile

pete57

134 posts in 2010 days


#11 posted 1714 days ago

I have pulled the tail piece off and checked the seating and it looks and feels good. When I roll the berings in the live center they roll smooth, but there is movement that is noticable when you tug and twist on the shaft and the bearings. I think I will try someone else live center and see what happens. Will let you all know. I did not have to use a steady when I did the same turning on the other lathe, which brings me to mention that this is vibrating when I use a light skew to just smooth things up.

-- Humble Wood Servant

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