dumb lathe spindle liner question

[mkd]

got a 1.5" stainless bar stock job for a lathe with a 2"+ drawbar bore.

 

 the stock is 3 foot long.

part quantity is 26.

A2-6   8" chuck with hard jaws (unless longer softjaws are better)

no bar feeder, just manual pull.

 

*** Would you limit the turning RPM instead of buying a spindle liner? if so, what is a good max?

 

[crazy^millman]

No. Buy the liner don't even risk it. Seen to many issues over the years. You can cheap out and put a donut on the shaft with a set screw, but that would be the least amount I would even attempt.

[mkd]

didn't think of the doughnut!

 

see, i knew three was a reason i like coming here.

thank you, Sir!

[Machineguy]

2 things.

1) get a liner for that stock. You shake the machine and not be able to run at the correct speed.

2) Get a bar puller, and write the commands to control it as a manual entry. Pull it up any time you need it for a bar pull.

This is one that mounts in the turrent. USSHOPTOOLS.com

[Guest]

Place I used to work

 

We had nylon liners from 3/8" up to 1-3/8 for a 1.5 ID tube

 

We would turn the OD part off, then hold and drill the ID

 

Sets were cheap and did the job

[mkd]

2 things.

1) get a liner for that stock. You shake the machine and not be able to run at the correct speed.

2) Get a bar puller, and write the commands to control it as a manual entry. Pull it up any time you need it for a bar pull.

This is one that mounts in the turrent. USSHOPTOOLS.com

http://usshoptools.com/prod_page_level_3_pdf.asp?mm_level_3_code=%20101100_31

 

interesting pullers. not sure exactly how they attach. Would be nice for me if they attached to my existing 1" square cutoff tool.

 probably no payoff this time around with only 26 parts

[Mr. M]

Liners from Trusty Cook are great if you will be doing it frequently. For a one time deal or typically low volumes I used the aluminum donuts with a setscrew or 3.

[mkd]

Liners from Trusty Cook are great if you will be doing it frequently. For a one time deal or typically low volumes I used the aluminum donuts with a setscrew or 3.

I RFQ'd them a couple hours ago.

 

I also see there are some liners for $200+ on ebay.

 

For 200 bucks, i don't mind NOT making a donut, and just paying.

 

 with all the professionalism and marketing with Trusty-cook, I'm scared of getting the quote$$$$

[Newbeeee™]

Place I used to work

 

We had nylon liners from 3/8" up to 1-3/8 for a 1.5 ID tube

 

We would turn the OD part off, then hold and drill the ID

 

Sets were cheap and did the job

John - be careful of using Nylon.

It can absorb water and grow considerably.

Acetal is the stuff to use for spindle liners.

[Mr. M]

They are not to expensive from what I remember. The biggest reason NOT to do a liner is if it will be rarely used and when it is used it is only for 1 or 2 bars, then you have these 3' liners taking up space on a rack to get used once a year. If you are going to use them more often, see if you can get a deal on 10 of the common sizes you might run and then make yourself a nice storage rack and be done with it 

[#Rekd™]

I have one of these with a VDI 30 mount. Works great.

 

http://barpullerusa.com/

 

Other option is like this.

 

[Newbeeee™]

I have one of these with a VDI 30 mount. Works great.

 

 

We have 2x Royal Bar Pullers - 1 for each machine

[Tim Johnson]

If you are pulling a four foot bar of stainless with the royal combo, you'll need to pull it less aggressively than the video shows. With that said the pulling accuracy is about .005".

[crazy^millman]

I have one of these with a VDI 30 mount. Works great.

 

http://barpullerusa.com/

 

Other option is like this.

 

 

Used them for years with great success.

[Machineguy]

Tim,

I hold .001 tolerance on a bar pull in a HAAS!. And its in the middle of the pgm with a tail stock support added also.

And the one Redk shows is the one I use. I also made some smooth jaws for it.

[Colin Gilchrist]

Considering that you've only got 26 pieces total, why not just cut individual blanks on the bandsaw, and not worry about a spindle liner, or having to pull stock? I understand that once you get setup with a bar pull/push method, it is much quicker, and you could program the machine to make each piece automatically. I'm all in favor of having the right tools available to make your operations more efficient, but sometimes I've found that the juice just isn't worth the squeeze...

[mkd]

Considering that you've only got 26 pieces total, why not just cut individual blanks on the bandsaw, and not worry about a spindle liner, or having to pull stock? I understand that once you get setup with a bar pull/push method, it is much quicker, and you could program the machine to make each piece automatically. I'm all in favor of having the right tools available to make your operations more efficient, but sometimes I've found that the juice just isn't worth the squeeze...

Did that on the first batch, because that is the material the customer supplied^^

Part is a turnbuckle/clevis deal.

No likey milling 1.5" stainless while holding on .25 diameter.

 

Boring those softjaws was no fun. doable, but no fun. ...and constantly worrying about spinning the part in the jaws, also no fun.

[Tim Johnson]

Tim,

I hold .001 tolerance on a bar pull in a HAAS!. And its in the middle of the pgm with a tail stock support added also.

And the one Redk shows is the one I use. I also made some smooth jaws for it.

I've had good luck with aluminum and plastic but have had issues with heavier pieces of stock. How fast are you pulling your stock?

[Machineguy]

I user the serrated grips for the heavy, large stock.

about 50 ipm max.

It also helps if you clean the stock and use like a WD-40 on it just enough so its not dry. It helps it slide better

[Brad Lisle]

If you really want to go cheap and want to make your own, buy some seamless steel tube with the ID just slightly larger than nominal bar diameter and make donuts to go ever the tube stock. Just use a plastic that will not absorb the coolant and swell.

[#Rekd™]

This is the exact one we have. It was money well spent IMHO. I pull 2" dia steel bars 20" long without a problem.

 

http://barpullerusa.com/epages/d00a8297-c144-4a1c-b317-955bf15da2df.mobile/en_US/?ObjectPath=/Shops/d00a8297-c144-4a1c-b317-955bf15da2df/Products/GA-MVDI304F

 

The parting tool combo (with springs) are a faster option as you do not need a tool change.

[mkd]

This is the exact one we have. It was money well spent IMHO. I pull 2" dia steel bars 20" long without a problem.

 

http://barpullerusa.com/epages/d00a8297-c144-4a1c-b317-955bf15da2df.mobile/en_US/?ObjectPath=/Shops/d00a8297-c144-4a1c-b317-955bf15da2df/Products/GA-MVDI304F

 

The parting tool combo (with springs) are a faster option as you do not need a tool change.

That's some considerable weight to be pulling, eh?

 Spring deal from USST probably wouldn't handle it consistently?

[mkd]

Just got a quote from  Trusty Cook.

 custom made liner for an oddball machine that they had no record of.

all for a great price

#1 in the market for a reason