Making a Lathe Spindle Indexer Part 1
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- čas přidán 13. 09. 2024
- Making an indexer/nose piece out of a Bridgeport dial for the lathe.
In this video we make a gauge to fit what will be our internal threads.
We also have some internal threading and thread measuring with thread wires. Part 1 of 2
Excellent! You are a master at describing the details other machinists on CZcams usually gloss over, and as a beginning beginner I appreciate that.
Thank You!
As someone who is new at machining, I'd like to say thank you for such an excellent description of what, where, when, why and how you do the things you do. Thanks for sharing! Great video.
You are very good at explaining and showing the details of what you are doing. I particularly like the shots in which I can see you (your hands) operating the lathe. There are enough close-ups of the tool bit doing work, but not enough of the lathe operator working the controls. Thanks a lot for this, particularly while showing the thread cutting operation. Excellent.
Your book is freaking awesome! To have the history of the book written in it is just amazing. Great find!
fiat," fix it again tomorrow" is what we say in the uk!lol great vids to watch,very informative for me as a 43 year old beginner machinist!
thank you.
Dan,UK
FIAT stsands for "Fix It Again Tony"
Very good video with great information. Excellent camera position, first class, thank you!
Hi, that's a excellent tutorial on threading, good views and explanations.
One trick to help with the thread measuring wires, just put a few blobs of snotty sticky grease on the threads they will help holding the wires to the part...
Cheers,
Pierre
You details are great for beginners or oldtimers that need to relearn the finer points. On bigger machines it is customery to set the crossfeed handle on the bottom for threading. My old lathe is very smooth and gravity will tend to work it toward the bottom of the rotation. Less likely to bump it reaching for the half nuts.
Nice video thank you for showing us in great detail how to cut threads on the lathe doing it slowly really did help me understand allot better :)
14:00 I love those South Bend back gears!!
Great video. Thanks for posting. A good tip for holding thread wires is to put some grease in the threads and the thread wires will hold with the blob of grease.
Thanks for the tip!
Good to see ya back buddy! Getting ready to watch Part 2.
I really enjoyed this video. Good pointers and well explained. Atrick I find for holding the thread measuring wires is to use a desktop size soft pencil eraser to hold the two wires together while holding the single wire and manipulating the micrometer .
Thanks for the tip
One of the first items I made for my lathe, after a threading dial, was a duplicate of the spindle nose to use as a chuck mount adapter and as a gage for future reference. I made it to match the spindle as exactly as possible, not to book tables, so I could be sure it fit everything exactly as the spindle does. The bored center hole done at the same time is a great way to mount and rotate chucks, backplates, etc on the bench and mill. Setup on the backplate is so much nicer when the axis is vertical
The so called register is simply the unthreaded portion of the spindle. Alignment is provided by the rear angle of the spindle thread and the face of the shoulder. If your chuck bears on the register the threads may not be engaging correctly. You cant have all three unless you have a perfectly matched set... For all your chucks... It can never happen. Check this yourself by loosening the chuck 1 turn and see if there is any play. There should be some slight motion. This is the reason backplates are finished on the machine they will be used on and chucks are not swapped between machines with threaded spindles. Also never never never seat a chuck by spinning it on. You will stretch or deform the threads and there goes your accuracy. Also a good way to break backgears or spindle lock when it comes time to remove it. Just tighten firmly with the chuck key. They don't come loose when used correctly. If it does, you have a problem like dirty threads or a burr on spindle or chuck.
My indexer is a thin plate exactly 1 thread pitch thick that is bored to slip on the spindle and set behind the chuck.This maintains rotational alignment and compensates for any eccentricity in the thread. Some clockmakers and jewelers lathes have threading attachments like this. Unimat uses that method too. Interestingly, my Unimat can thread right up to a shoulder with no relief. Can you? Also, I don't worry about it slipping any more than I would about the chuck backing off. Not that much force when scribing, drilling, or light milling.
I wish I would have thought to use a saw blade like Tubalcain did, much easier and very accurate. Or maybe I just didn't have the right saw to see it 30 years ago. I was too busy converting my machines from line shaft drive and designing a threading dial for my 7/8-9 leadscrew and figuring out how to cut any pitch thread, inch, mm, fractional or decimal, on a change gear lathe built 110 years ago. No modern manual machine can do that. Info can be found in early manuals and handbooks. Hint, it's all in the gearing. A 6 5/8 per inch thread on a newer lathe is more complicated than compound differential indexing.
Anyway, I like your videos, really good views. I like your "newer style" lathe, too. Please keep them coming.
Thanks, Mike.(o\!/o)
I run 2 manual and 2 really nice Mori seiki high tech lathes at work 8 hours a day and it would be so awesome having my own at least a manual lathe at home. It would be my favorite toy for sure.
You can use any of the end gears to index the spindle, depending on the desired amount of rotation, down to small fractions of a degree.
It's the simple things.....
When using the three wire method try this. Lay a board across the lathe ways. Put a glob of modeling clay or Play-Doh on the board. Stick the three wires in the clay. Now your hands are free to use the micrometer.
Seen the Video again and found it refreshing and very helpfull in my gear cutting project. Thanks a ton to you. Keep up the good work and always help with your abundance of knowledge and experience. Be safe, be healthy. Greetings from New Delhi, India. Thanks
Good long complete training video. Thank you so much
thats a beautiful little lathe you have there.
You can hold those wires on with rubber bands or o rings and that leaves both hands free to mic
Yay new upload! Lemme get a cup of coffee.
Here's a little tip for using thread wires. Put a little grease on them. They will stick to the metal and will still be fluid enough to move. Best of all, it's a liquid so it will hardly effect the measurement at all, and if it does, it will only be .0001'' at best.
I enjoyed your video. Good explanation of what you are doing. I don't know if this will help but I use 2 rubber bands to hold the thread wires. one on ether side. works quite well.
Turn the shaft so you can indicate it for later use.
You never know when you might need an 1-1/2 - 8 arbor for something.
Use some clay or play dough on the bottom wires to hold them.
The spindle is your plug gage. I've never read them with wires, but you would have to assume they are perfect or the same as every other South Bend spindle. js.
I have the 30th edition of the Machineries handbook and for any out there they do still have the equations, tables and charts included from the first version through the 29th. To my knowledge they haven't taken away anything from the handbook. Only added new information. Just for anyone out there interested in the text.
Good old school stuff........!!
Very good work.
super great video ! I learned a lot.
If you sit your dial indicator on your tail stock or cross slide and lay against your tool holder there is no need to think about varying numbers due to the compound angle, you can simply read the depth of cut
Being on such a small lathe you will probably find this hard but with a little fooling around it can be done, also if you dont have your indicator laid on true to perpendicular you can have some error
understanding the relationship of angles and read distances allows you to check the accuracy of your compound slide angle gauge far more accurately
Good video Greg i have a boxford lathe which is a southbend clone interestingly the thread on the boxford is 11/2" 8 tpi BSF which is a Whitworth form thread 55 degrees which is a standard size thread this side of the pond instead of your american 60 degrees thanks for sharing Dave
We just like to be different :-)
Greg, just thinking out loud but what would be effective is making a clamp across your ways and incorporating a spring loaded pin upwards to the outside boss of your spindle indexer. A series of small holes on the indexer will align with the pin and get you more accurate degrees.
It's an option. I have an old soft nail setter that I can grind to fit the engraved lines nice.
***** Ok I understand what you mean. However you will probably get movement and play since you won't be able to actually lock in the index with a pin. By indexing a series of holes on the outer small boss of the part you made you can lock it in with a pin from underneath and secure any play or movement. You can get a 1/8th spring loaded dowel pin coming off a simple bed way clamp. I think I found a project to do this weekend :)
Another method to hold the three wires in place while measuring is to use two small rubber bands... one on each side of the work piece.
Good video. I bought a thread micrometer.
I can't seem to get a large dial, I plan on making one (Actually I already have one for the cross slide, I just can't find a matching one for the compound) -- but then again, I DO have a small B&S dividing head and making 200 divisions is straight forward. The one thing that will be difficult is replicating the matte silver finish that the original big dials have and stamping the numbers cleanly. However if I find one first, I will buy it, because it's rather involved process. For those interested in this sort of thing George H. Thomas' "Model Engineers Workshop Manual" & "Workshop Techniques" are excellent references for things like making dials and more especially marking them and stamping the numbers. Problem is you have to build equipment to do a professional looking job, that doesn't look like it was done in fifth grade metalshop class! There's the rub!! As an incidental note I have a 1947 SB 9" Model A.
I see you sleep about as much as I do. Lol.
Nice shirt. :)
What is this sleep you speak of? Isn't that why they make coffee?
Greg, I know it’s been a long time since you made this video but I was just curious as to what fixed the problem at the 9:10 mark? I originally saw this videos a few years back and came back just for that part! Thanks in advance! -Adán
I just didn't extend the tail stock quill far enough.
Greg,
Thanks for the video! Damn! You need 3 hands using those thread wires. Your project looks interesting. I'll have to check out Part 2 and see the completed project. How's life in the Boston Area these days? Is fall in the air?
Have a good one!
Dave
Yup getting cooler by the day. Leaves are changing and all those leaf watchers will be up here soon.
A little blob of grease will hold the 2 wires in place .
Engineers sometimes measure angles in gradians instead of degrees. I guess they felt the 2500 year old Babylonian system needed an update. Can’t leave anything alone. Anyhow there are 400 gradians in a circle, so each division of your 200 division wheel is exactly two gradians. To convert degrees to gradians multiply by400/360 (which reduces tp 10/9 or 1.11111...). Cool thing about gradians is that a 90 degree angle is 100 gradians, which would be 50 divisions on your wheel.
What is the difference between cold rolled bar stock and hot rolled?
+John D Cold rolled is more expensive yet has a better surface finish and closer dimentional tolerance. Hot rolled is cheaper , but because it's worked while the metal is hot it can shrink and has a looser dimentional tolerance. It also has that hard black mill scale. It's good for welding, but CR is better for machining in my opinion.
The music is good too ...
Thanks for good info. If you edited out some redundancies, this would be a great video!
What happened to your hand? I don't remember seeing it in the previous videos.
Cool video man. Where are you from? U talk like a Rhode Islander
Massachusetts
Why do you thread towards the shoulder of the work in stead of away from where you don't risk hitting anything?
because he has a screw on chuck.
Is there a way to lock the chuck on so it can run in reverse? My machine has the camlock system.
Hey I was admiring your sb lathe. would you mind telling me what model it is
It's a 1950 Southbend Model A
Now lets say you dont know the 4 jaw was the same thread as the spindle how whould you work out the internal thread.?
+gigabytex64
With a gauge
Could you elaborate or do a video on it. Please
+gigabytex64
It's the subject of this video.
Take a look at the last few tubalcain videos where he does something similar.. interestingly, he uses a table saw blade with 100 teeth to index to 100 graduations..
I'll have to check it out
Why don't you put two wires on top and one on the bottom ? Looks like it would be easier
You want two against the stationary anvil.
***** ........? why?
good!
Where’s your tailstock wrench…?
since you don't need to hold it- why not put 2 wires on top and one on bottom
in your opinion which best around , bushing or bearing? thanks
+julio cesar Mendes
Each have their uses. Obviously bearings are more robust, but with proper care and oiling bushings can last forever. Thats basically what these southbend lathes have in their spindles. A cast iron bore as the bearing surface or a bronze bushing.
grateful, because I have one with brass bushings, thought to change for bearings , but as I think very noisy bearings , I will leave with the dowels , after his tip , for use only as a hobby.
what is the lathe model on this video
Rumen Gergushki
Its a Southbend 9" model B, Heavily modified to something between a 9" model A and a Southbend Heavy 10.
Hi are you a hobby guy or a machinist as a provisional
Hobby. HVAC Tech by trade and training.
Halligan142 you have a great Chanel. I am 70 years old and just picked out a lablond lathe, a Bridgeport mill and a Boyer Schultz Serfice grinder. I am a builder by with no experience at all did you teach your self the machinist stuff? I guess the more you do the more you learn.
Santo Pezzotti
Yes 90% self taught by reading, watching videos, and screwing up. Only formal class experience I had was spending a week in a machine shop class 23 or so years ago when I was a freshmen at a vocational high school.
Thanks I think I am going to be self taught. Really looking forward to it thanks again you have a great Chanel
When measuring the thread wires I use rubber bands to hold them in place and then measure them, a whole lot easier. rngr1
A heavy grease also works
Wow, is this guy the voice of Peter Griffith from Family Guy?
heheheheheheheheheheeeeee
Wrong state
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what is the lathe model on this video
1950 Southbend model A