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S_J_H
07-01-2007, 08:30 PM
Well I decided to go ahead with the project that was discussed in this thread-
http://bbs.homeshopmachinist.net/showthread.php?t=24394&highlight=cnc+lathe

I took some pics today as it is just beginning to look like a machine.
The lathe will be 24" long with a swing of 10+" and around 12" between centers. The bed is 1" thick x 5" wide steel, and the rest of the bed support frame work will be 1/2" steel. It is all bolted together with 1/4-20 capscrews.
I have only a small 9x20 import lathe and x3 mill to build this so dimensions have to fit within my capabilites. Just drilling the 24" long 5" wide bed on my x3 mill was time consuming as I only have 15" X travel.
The headstock is adapted from a mini lathe and the headstock riser adapted from a mini mill. The motor is a 350watt dc motor and variable dc drive. 15mm HTD belting to a triple bearing jackshaft driving dual 3mm polyflex belts for the spindle. It will be a light duty machine mainly used for cnc chucked work. I have not decided yet if I will add a tailstock.
I will be using HiWin linear rails/blocks. 4 each for carriage and cross slide. Rolled ballscrews and dual preloaded ballnuts for each axis.
I will build a pneumatic locking turret auto tool changer rotated by a stepper. I will use this guys very nice design and scale it down a little for my machine-
http://www.issintl-inc.com/latheturret/
As shown in the photos it already weighs 93lbs and there is a long long way to go.. I'll estimate it's final heft at 150-175lbs. That's pretty good as if I pulled all the manual stuff that does nothing to contribute to rigidity off my 9x20 import it would be around the same weight.
No plans, I'm building this sort of on the fly using ideas of my own and from others.
Hopefully it will be a nice fun machine to use when finished.

Steve

http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cncbenchlathe005.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cncbenchlathe004.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cncbenchlathe003.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cncbenchlathe002.jpg

jkilroy
07-01-2007, 08:56 PM
Very nice, you look to be well on your way. Unless you have other plans you might consider milling some holes in the top of the bed so chips have a place to fall.

S_J_H
07-01-2007, 10:50 PM
Yes I have been thinking about areas for the chips to drop through. I am not certain yet how I want to deal with that. The linear blocks will have scrapers and seals to keep chips out and since the rails are on risers there will be a lot of area for chips to collect.
Steve

S_J_H
08-18-2007, 08:38 PM
Here are a few pics of my progress if anybody is interested. It's coming together well. The cross slide is pretty much done. The movement is so slick I can back drive the cross slide and ball screw with 1 finger. Still a long way to go though.
Steve
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe005.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe004.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe003.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe002.jpg

tattoomike68
08-18-2007, 08:43 PM
Thats trick., it looks like a ton of work. I bet you are eager to get it running and making chips.

lazlo
08-18-2007, 09:32 PM
Very impressive build Steve -- something you can be proud of!
Are you going to add a leadscrew for threading, or are you going to put encoders on the spindle and do an electronic leadscrew?

Can't wait to see it make chips!

JS
08-18-2007, 09:36 PM
Wow nice work

Bill in Ky
08-18-2007, 10:07 PM
Great work there! Very nice finish.

C - ROSS
08-18-2007, 11:48 PM
Nice work.
Keep us posted as to progress.

Ross

Fasttrack
08-19-2007, 12:40 AM
:eek:



wow!

wierdscience
08-19-2007, 01:04 AM
Nice!:cool:

Evan
08-19-2007, 05:27 AM
Dang. Now I have to build a lathe to go with my mill. Wait. First I have to finish the mill. Then build a lathe.

Beautiful job so far.

Ian B
08-19-2007, 07:36 AM
Steve,

Very nice work!

Those red & green blocks; I guess they're way cleaners. Did you make them, can you tell us a bit about them?

Thanks,

Ian

lazlo
08-19-2007, 10:47 AM
Those red & green blocks; I guess they're way cleaners. Did you make them, can you tell us a bit about them?

Those are the HiWin linear bearing blocks.

Lew Hartswick
08-19-2007, 11:12 AM
Why are the holes in the bed tapped?
Beautiful work.
...lew...

Too_Many_Tools
08-19-2007, 12:18 PM
Yes I have been thinking about areas for the chips to drop through. I am not certain yet how I want to deal with that. The linear blocks will have scrapers and seals to keep chips out and since the rails are on risers there will be a lot of area for chips to collect.
Steve

A CNC lathe can operate in any position.

How about rotating the lathe 90 degrees on its X axis so the chips fall out the backside (now on the bottom) of the lathe into a pan?

TMT

Too_Many_Tools
08-19-2007, 12:23 PM
I forgot to say that I am impressed with your effort. ;<)

I look forward to future posts.

TMT

S_J_H
08-19-2007, 08:20 PM
Thanks everybody!

Lazlo, I will be installing a proximity sensor on the spindle and then run that signal into Mach for threading.

Lew, I will be adding a tailstock that will also ride on the z axis rails. In order to lock it in position on the rails there will be a post on the tailstock that can be locked down to the bed to any of the tapped center holes in the bed.

TMT, yes I thought about that. I guess I just wanted to stick with a conventional layout. Although I suppose it could be mounted in any position.

Steve

a1a5115
08-20-2007, 10:18 AM
Hi,
This is a prodject on my to do list. What controls are you planning on using? I built a CNC mill in about two years. I bought a controller kit from Max NC. Very easy to use but their support is terrible. I have heard that they have been bought out. Maybe that will bring some improvements. Anyway, I have pretty much ruled them out for the lathe prodject.
Good luck,
Paul

hoof
08-20-2007, 11:02 AM
Please allow me to be envious, When I grow up I want to be that talented.

S_J_H
08-20-2007, 11:16 PM
Hi,
This is a prodject on my to do list. What controls are you planning on using?
I'll be driving the motors with a xylotex drive and 269oz steppers I have left over from my old mini mill. I use mach3 to control it.

Steve

Too_Many_Tools
08-21-2007, 12:01 AM
Thanks everybody!

Lazlo, I will be installing a proximity sensor on the spindle and then run that signal into Mach for threading.

Lew, I will be adding a tailstock that will also ride on the z axis rails. In order to lock it in position on the rails there will be a post on the tailstock that can be locked down to the bed to any of the tapped center holes in the bed.

TMT, yes I thought about that. I guess I just wanted to stick with a conventional layout. Although I suppose it could be mounted in any position.

Steve

Another position is to mount the lathe on its tailstock end....space challenged shops (i.e. submarine shops) often do this. Mounting it on its back would give you more control as to chip handling.

TMT

Ian B
08-21-2007, 05:13 AM
Looking at the bed, why not go the whole hog; install a powered rubber conveyor belt system to transport the chips under the saddle & tailstock and dump them straight in the bin. Just what I always wanted - a self-cleaning lathe...

Ian

S_J_H
08-31-2007, 12:26 AM
Hi all,
Just a couple progress pics. I still have a long way to go but I am pleased with everything so far.
Steve
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe012.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe014.jpg

mochinist
08-31-2007, 03:58 PM
wow very cool, nice work man

S_J_H
10-27-2007, 05:57 PM
It's done. Some major changes were made to the drive system as you can see..
It now uses a bench mounted 1hp 3ph inverter duty motor/VFD and a 8mm V-belt 4 step pulley system. The motor is mounted on a slide table for tensioning and pulley position changes. The VFD drive is controlled by Mach3 via a small add-on speed controller board from cnc4pc.com.
The spindle has 2 tach sensors. A photo sensor that runs the external tach and a proximity sensor that sends a signal to MACH3. It will cut any threads and can run with constant surface speed control. The spindle rpm range is from 100-4000 rpm. It will easily, very easily cut .1" deep in leaded steel of 1" diameter without the slightest moan. For such a small machine it is very rigid. It easily out performs my much larger 9x20 in cutting power/metal removal rates. The linear rails are parallel to the spindle under .0002" in 10" of length.
Well that's about it I guess.
A few pics and a quick and dirty video of it cutting .095" deep in some 12l14. I'll take some better vids of it threading and profiling in the near future!
Steve
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe071.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe070.jpg
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe069.jpg
link to video of it cutting- http://s109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/?action=view&current=095doctest.flv

S_J_H
10-27-2007, 06:12 PM
oh just a clarification, I am not using that QCTP post setup shown in the pics. That was just for testing. I am using a 4 way that allows better tail stock access. You can see it in the vid.

Steve

wierdscience
10-27-2007, 11:01 PM
Very nice work!

gzig5
10-28-2007, 12:13 PM
Steve,
Is that some kind of wire reinforced hose that is covering the ball screws? Could you elaborate on what it is and where you found it?
Greg

S_J_H
10-28-2007, 09:17 PM
Greg, it's just some duct hose I had laying around. Mcmaster.com has all sorts as well as bellows and way covers.


Here are some much better videos showing what the lil' machine can do. It sure can rock and roll! These are just MACH3 wizard setups. No programming needed. I made these is less than 5 minutes each.
Heck I even narrated these videos ,lol
They are between 10-20 meg and about 2 mins long.

Link to Video showing the lathe cutting below threads in steel at 500 rpm.
http://s109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/?action=view&current=cncthreading.flv

http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe077.jpg

Link to Video showing the below simple radius cut using constant surface speed as well-
http://s109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/?action=view&current=radiustest.flv
http://i109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/cnclathe083.jpg

A simple constant surface speed demonstration-
http://s109.photobucket.com/albums/n48/S_J_H/cnc%20bench%20lathe/?action=view&current=CSStest.flv

Hope the vids show a little bit of what she can do. This machine was built with no plans, just on the fly. It was a great learning experience and If I can do it anybody can!

Steve

andy_b
10-28-2007, 10:47 PM
totally cool!!!!
that would be the perfect sized machine for me to keep in the basement for small projects when i don't feel like going out to the shop in the winter.

if you don't mind me asking, about how much do you have into it (money wise, not time wise)? if you don't want to say, i understand.

andy b.

S_J_H
10-29-2007, 08:39 AM
Thanks Andy,
This project was attractive to me because I had so many of the items needed already. I had the spare 3 axis drive system and a lot of mini mill and mini lathe parts which is what I made the headstock and tail stock from. The 1hp 3ph motor and vfd used to be on my 9x20 but I figured it would be much much better used on the cnc lathe, so I put the old motor back on the 9x20.
The linear rails and 10 trucks cost me around 500$. The bed and carriage assembly cost me about 400$ in raw materials to build. The speed control board to run the VFD was 30$ and the proximity sensor 20$. Then probably another 250$ in drive parts( ball nuts, bearings, x axis belt drive) but I had a lot of those parts as well.
If one was to make one of these from scratch and had to purchase everything including the cnc electronics I'll guess it would be around 2500$.
Steve

Corm
10-29-2007, 10:56 AM
Very Impressive! I can only dream of having the skills required for project such as this.

andy_b
10-29-2007, 12:41 PM
Thanks Andy,
This project was attractive to me because I had so many of the items needed already. I had the spare 3 axis drive system and a lot of mini mill and mini lathe parts which is what I made the headstock and tail stock from. The 1hp 3ph motor and vfd used to be on my 9x20 but I figured it would be much much better used on the cnc lathe, so I put the old motor back on the 9x20.
The linear rails and 10 trucks cost me around 500$. The bed and carriage assembly cost me about 400$ in raw materials to build. The speed control board to run the VFD was 30$ and the proximity sensor 20$. Then probably another 250$ in drive parts( ball nuts, bearings, x axis belt drive) but I had a lot of those parts as well.
If one was to make one of these from scratch and had to purchase everything including the cnc electronics I'll guess it would be around 2500$.
Steve

Steve,

thanks for the info. that isn't too bad for what you ended up with. i think i'll have to start scrounging and watching ebay for deals and see what pieces i can find. i really wish the price of scrap wasn't so high because the scrap yard by me always used to get big chunks of steel cutoffs in. they would have been perfect for the bed.

andy b.