Basic Lathe Adjustment

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Dark Tranquility
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Basic Lathe Adjustment

Post by Dark Tranquility » Thu Feb 23, 2006 10:55 pm

So I bought a Grizzly G4000 about 2 months ago but haven’t really had a chance to use it yet. I take it out for its first spin and I put a tool bit (or whatever their called) into the tool holder and immediately run into a problem. I am attempting to face a piece of aluminum but the tool bit doesn’t line up with the center of the work piece so if I go to face it I will end up with a large center post.

I know this is a stupid question but I don’t know the first thing about lathes except what I’ve read online. I can’t seem to find anything about raising the tool bit up to the center line; and there doesn’t seem to be any adjustment.

Any help would be appreciated.

Thanks, Dan

HandyMan
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Post by HandyMan » Thu Feb 23, 2006 11:07 pm

The tool post on the G4000 does not have any built-in adjustment for tool height. You will have to use spacer shims under the tool bit to get it to the correct height. Take a facing cut, and then measure the post on the end of the bar. Divide that by two to get the thickness for the shim.

I would recommend that you invest in a quick change toolpost for your lathe. It may seem like a lot of money for something you already have, but the time and frustration you will save will pay you back in no time. You will quickly learn that the initial price for the lathe is only the start. Tooling is where you will spend real money. I just purchased a collet chuck for my lathe for $950. It was a bargain at that price.

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Post by David Hineline » Thu Feb 23, 2006 11:49 pm

I use busted off bits of hack saw blades for spacers.
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Post by gevarm » Fri Feb 24, 2006 1:10 am

use your live or dead center in the tail stock as an height indicater,shim til your cutting tool ( brazed carbide hss or insert) top edge of tool, is exactly on center or a couple of thou below center,or better yet get an adjustable tool holder set up, much faster, especialy when changing between a facing tool,parting tool threading etc, expect to pay twice what you payed for your lathe in tooling before your done, its not that painful one peice at a time, the amatures lathe is a good starting book IMHO, money well spent as it shows most metal lathe operations, 20 years later i still refer to this book on ocasion, best regards and happy turning. :D

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travelingman
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tool post

Post by travelingman » Fri Feb 24, 2006 2:14 am

I will have to go along with HandyMan. A quick change tool post is the only way to go. Mine is an aloris but there are other brands out there. Check out ENCO they have quite a bit to choose from, expensive to very reasonable. Good luck

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Post by jfk » Fri Feb 24, 2006 2:58 am

Use a pair of metal snips and cut up some metal pallet straps. Have a bunch on hand and use them to shim your way up to the tail stock or dead center.

Whenever you change tooling (boring bar, threading, etc.) remember how shims it takes to get you back on center.

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rockpup
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Post by rockpup » Fri Feb 24, 2006 6:13 am

A picture would be helpfull. On ours the way the bit holder is clamped down allows us to shim it to adjust the height. This way various styles of bit holders can be used.

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Post by centurion » Fri Feb 24, 2006 8:08 pm

Do yourself a big favor now and get an Aloris type quick change tool post.
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Post by triggerfinger » Sat Feb 25, 2006 1:50 am

Check this site out, it's got a lot of pointers on basic lathe use on the bottom links.

http://www.mini-lathe.com/Mini_lathe/Ve ... rsions.htm

And if you haven't read it already, this thread is very informative from AR-15.com.

http://www.ar15.com/forums/topic.html?b=3&f=14&t=233879

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Dark Tranquility
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Post by Dark Tranquility » Sat Feb 25, 2006 11:50 pm

Thanks guys, I got it going and made some basic cuts.

I’ve been going to the mini-lathe site now for quite a while. Looking back now I see the spacers he used in some of his pictures. Thanks for the AR-15 link.

So what’s a good quick change tool post; and how do I know it will fit my lathe (Grizzly G4000)

Thanks, Dan

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Post by HandyMan » Sun Feb 26, 2006 12:49 am

Littlemachineshop.com has a neat tool post for $75.00. It is aluminum and looks to have about the same versatility as larger models. It is pretty small, however. The largest bit you can use is 3/8". They also have larger tool posts, but the price goes up. What do you plan on making with your lathe? If you are going to turn aluminum and mild steel, then the small tool post is fine. However, if you are looking at machining stainless, titanium, or tool steels, you will need a larger model.

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Dark Tranquility
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Post by Dark Tranquility » Sun Feb 26, 2006 12:15 pm

Well to start I would like to shorten crown and thread barrels for suppressors. Eventually I would like to form 1 my own suppressor.

Thanks, Dan

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Post by HandyMan » Sun Feb 26, 2006 12:45 pm

Well, I would recommend the 100 series tool post by Grizzly. It comes as a set with 5 tool holders. The only problem I see is the compound slide on your lathe does not have a T-slot. It looks like the turret post you have now is threaded directly into the compound. You would have to make modifications to fit the 'standard' tool posts that come with a T-nut. The reason I went with Littlemachineshop.com is they have tool posts set up for your lathe. I don't see a problem with a lighter tool post for your application.

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Re: Basic Lathe Adjustment

Post by bailey hudson » Mon Dec 02, 2019 8:02 am

Hi.. I'm a beginner with these kind of projects. What kind of lathe will be most appropriate for a novice like me? Thanks in advance for anyone who'd help :D

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Re: Basic Lathe Adjustment

Post by bailey hudson » Mon Dec 02, 2019 9:21 am

I went and searched for some quality lathes and found this site - SummitMT - https://www.summitmt.com/product-category/metal-lathes/
I'd love to hear anyone's thoughts.

Also found a resource on metal lathe projects that can help me out as a beginner. https://www.summitmt.com/metal-lathe-projects/

What would be the best way to go about starting projects as a beginner? Do I go full on and have a big lathe? Or are mini-lathes ideal? And will they last long?

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Capt. Link.
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Re: Basic Lathe Adjustment

Post by Capt. Link. » Mon Dec 02, 2019 2:37 pm

Hacksaw blades with the teeth removed work well for tool-post shim stock.A rocker type lantern tool post would be a economical addition to your machine.

Southbend "How to run a lathe" https://www.amazon.com/How-Run-Lathe-Be ... 799&sr=8-3

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bailey hudson
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Re: Basic Lathe Adjustment

Post by bailey hudson » Tue Dec 03, 2019 5:19 am

Capt. Link. wrote:
Mon Dec 02, 2019 2:37 pm
Hacksaw blades with the teeth removed work well for tool-post shim stock.A rocker type lantern tool post would be a economical addition to your machine...
Thank you so much for this. I'll give it a look. :D

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mr fixit
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Re: Basic Lathe Adjustment

Post by mr fixit » Tue Dec 03, 2019 10:55 am

Also go over to Hobby Machinist site. Lots of good information and help there.

https://www.hobby-machinist.com/forums/ ... -here.208/

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