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View Full Version : Mini-lathe Taper Attachment Concepts



nitacboss
05-29-2003, 01:03 AM
Has anyone ever given thought to designing a small taper turning attachment for one of the small 7 x 12 mini-lathes? I realize you'd need to disconnect the cross slide screw but it just don't seem like it'd be a big deal. I figure a cam follower on a bracket attached to the disconnected cross slide picking up a slot milled into an angle adjustable bracket mounted to the back of the bed. Opinions, ideas, comments?

Thrud
05-29-2003, 03:58 AM
Go for it - you could write it up for HSM as the mini 7"x10" seem to be a popular lathe.

nitacboss
05-29-2003, 08:33 AM
Well OK Thrud, thanks for the push. I think?

Could one of you guys please tell me how the taper attachments on the "big" lathes work. I have not been exposed to a lathe with such an attachment since shop classes in high school and cannot remember how they work or were set up. Also how was the actual taper adjustment to the attachment made?

nheng
05-29-2003, 10:29 AM
It would be slick if someone could come up with a design in which you throw a small flat (or timing) belt over your crossfeed handle and the taper attachment drives it with just enough slippage to keep it pre-loaded against the taper "drive" pin or whatever. Just like the take up reel on old reel-to-reel recorders.

In the yahoo Super 11 group (Emco), I posted some manuals in .pdf format a while back. One or both of them have an exploded parts view of their taper attachment. I took a copy of the image into paintshop pro one evening and in about 5 minutes of cut and past, had a pretty good looking picture of what it looks like imploded. Dumbass didn't save it though.

You could also mount your cutting tool in a separate block, mounted on and driven by the taper bar. I think the Emco may have been done this way. I seem to recall it had several dovetail slides.

Like Thrud says, write it up for HSM if you come up with a plan. It would be nice to see more stuff like this or the b--tchin vise in future issues http://bbs.homeshopmachinist.net//smile.gif

Den

SGW
05-29-2003, 10:33 AM
I think if you rummage around on http://www.metalworking.com/ you can find some plans for a taper attachment, which may give you some ideas.

G.A. Ewen
05-29-2003, 03:40 PM
nitacboss, A friend of mine has a taper attachment on a Standard Modern. I will take a photo of it tonight when I'm in town and E-mail it to you. It may give you an idea where to start. Regards, George.

Rotate
05-29-2003, 03:53 PM
George, send it to me and I'll post it for everyone to see.

Albert

lynnl
05-29-2003, 03:58 PM
Den, as I recall one of the 'Metal Working' or 'Projects..' books contains a mod someone made much like you suggest. Don't remember if its function was taper turning, but it did incorporate linkage to tie either the x-Slide or compound feed to carriage travel.
I'll try to remember to dig that article up and describe more fully.

nitacboss
05-29-2003, 04:04 PM
<font face="Verdana, Arial" size="2">Originally posted by G.A. Ewen:
nitacboss, A friend of mine has a taper attachment on a Standard Modern. I will take a photo of it tonight when I'm in town and E-mail it to you. It may give you an idea where to start. Regards, George.</font>

G.A.,
That would be great!
Rotate,
Thanks as well!

I also heard through a friend that he remembers his dad's lathe (make unkown but to his long since deceased father) had its taper attachment through a rear mounted lead screw type contraption. God what complications that must have been! Apperently, from what he remembers, the rear lead screw was driven by a second set of gears. This in turn transmitted power to a acme screw on the cross feed. The front lead screw drove the saddle and the rear drove the cross slide and the whole thing drove his dad nuts! I wonder if it can get any more complex than that?



[This message has been edited by nitacboss (edited 05-29-2003).]

Peter S
05-29-2003, 09:16 PM
There are several Yahoo Groups dedicated to mini-lathe projects. Here is one that has a few articles on taper turning attachments. You will have to join the group (I think), just remember to edit your preferences so as not to receive advertising etc.
http://groups.yahoo.com/group/mlathemods3/

go to Files, then Taper Turning, there are several to look at, eg. a taper turning attachment for Emcomat 7-8 & 9x machines.

nitacboss
05-29-2003, 09:49 PM
STOP!!! I found it! Or rather Peter S. found it. http://bbs.homeshopmachinist.net//biggrin.gif

Go to http://groups.yahoo.com/group/mlathemods3/ (and yes, you will need to "join" this group to do so) and open the link to "FILES". There you will find a very cool .pdf file named "PM-taper_att.pdf" which will get you a January 1962 story about a small lathe taper attachment.

About the only thing I had envisioned that was totally different was that I would use a cam follower (to reduce friction) and slot (to provide guidence) and they use a guide rod and slide.

Now I must go the the washroom, er...um, reading and patent examination room, and have a fifteen minute "sitdown" to study the drawings... http://bbs.homeshopmachinist.net//wink.gif

Thanks to everyone who helped out!!!

[This message has been edited by nitacboss (edited 05-29-2003).]

Rotate
05-29-2003, 11:13 PM
These are pictures that George has sent to me. The wood splitting screw, which I gather was turned using the taper attachement looks cool.

Taper Attachment1 (http://members.rogers.com/rotate/Ewen/Andys_taper_att_001.jpg)
Taper Attachment2 (http://members.rogers.com/rotate/Ewen/Andys_taper_att_002.jpg)
Taper Attachment3 (http://members.rogers.com/rotate/Ewen/Andys_taper_att_003.jpg)

Wood Split Screw1 (http://members.rogers.com/rotate/Ewen/Andys_wood_split_screw_001.jpg)
Wood Split Screw2 (http://members.rogers.com/rotate/Ewen/Andys_wood_split_screw_002.jpg)


[This message has been edited by Rotate (edited 05-29-2003).]

G.A. Ewen
05-30-2003, 12:00 AM
The wood splitting screw was made by my friend Andy Bradette on a 11 x 24 Standard Modern with the taper attachment. ( 4 tpi.)

Thrud
05-30-2003, 12:11 AM
Peter S:
Next time you troll that site could you email me the Emco taper attachment? I refuse to yahoo. In return I could mail you a chunk of meatloaf...or not! http://bbs.homeshopmachinist.net//biggrin.gif

George
Neat screw - will it work on Cretian?

[This message has been edited by Thrud (edited 05-30-2003).]

nitacboss
05-30-2003, 12:19 AM
Thanks for the photos guys!!! It is the same rig as the PopMech 1962 attachment, just beefed up a bit. Thrud, your Emco file is on its way...
Again, thanks for all your help.
Hank

nitacboss
05-30-2003, 12:23 AM
<font face="Verdana, Arial" size="2">Originally posted by Thrud:
In return I could mail you a chunk of meatloaf...or not! http://bbs.homeshopmachinist.net//biggrin.gif </font>

What if I don't like meat loaf? Could I get a pint of dark amber maple syrup instead? http://bbs.homeshopmachinist.net//biggrin.gif



[This message has been edited by nitacboss (edited 05-30-2003).]

G.A. Ewen
05-30-2003, 07:25 AM
Thrud, "will it work on Cretian?" - I don't know but I bet that if we turned off a bunch of them and advertized them for that purpose we would make a fortune. http://bbs.homeshopmachinist.net//biggrin.gif

lynnl
05-30-2003, 10:43 AM
That article I mentioned above is in vol 3 of the "Projects" series of books. The author was a "Barbour" (don't recall full name), and the article was a Simple Taper Attachment for Under $5.00. It used a spool and bicycle brake cable to drive the crossfeed. Tho it was set up to turn only one specific taper (.75" per foot I believe). But the concept could probably be adapted for more universal use.

Thrud
05-31-2003, 01:50 AM
nitacboss:
Thanks for sending it to me! MUCHO APPRECIATED.

I live in Alberta - the closest thing we have to maple syrup is when Labbats drains the vats at the brewery. http://bbs.homeshopmachinist.net//eek.gif

If you have some diamond tools you could make meatloaf bullets! http://bbs.homeshopmachinist.net//biggrin.gif

Love your site too. If I ever get down that way I would like to check the facilities out.

nitacboss
05-31-2003, 11:12 AM
<font face="Verdana, Arial" size="2">Originally posted by Thrud:
nitacboss:
If you have some diamond tools you could make meatloaf bullets! http://bbs.homeshopmachinist.net//biggrin.gif </font>

Thrud,
You are being a complete idiot here!!
Everyone knows that you'll ruin the rifling in the barrel with a single shot of meatloaf. Just one shot and Brother it is all it over! SMOOTHBORE!! Now, if you were to suggest a pasta or cornflake bullet that'd be another story... http://bbs.homeshopmachinist.net//biggrin.gif http://bbs.homeshopmachinist.net//rolleyes.gif


[This message has been edited by nitacboss (edited 05-31-2003).] who is going to learn to properly work UBB codes one day...spelling might be nice too!


[This message has been edited by nitacboss (edited 05-31-2003).]

Thrud
05-31-2003, 06:11 PM
nitacboss:
...I meant for the Smoothbore Abrams tank gun! Some peoples children... http://bbs.homeshopmachinist.net//biggrin.gif

nitacboss
05-31-2003, 06:58 PM
<font face="Verdana, Arial" size="2">Originally posted by Thrud:
nitacboss:
...I meant for the Smoothbore Abrams tank gun! Some peoples children... http://bbs.homeshopmachinist.net//biggrin.gif</font>

Ahhh...now I understand...

Here, I looked it up: Depleated taste meatloaf penetrator rounds (DTMPR's). I suppose they use some sort of tomato sauce based propellent as well... http://bbs.homeshopmachinist.net//rolleyes.gif

uute
06-01-2003, 01:12 AM
Chris Heapy has a very nice set of plans on MetalWebNews - I think? I prefer his design to the PM, but it apears to involve more work.

The Standard Modern - now there's a TAPER ATT!! Don't have to ask "Where's the BEEF?"
That attachment weighs more than my machine!

It also answered something I've been wondering about for some time -- wether/why you would need a dovetail on the attachment ways. The S M seems to have vertical box ways (thoug they look to be quite tall/deep). Box ways would simpify a homemade unit.

Any comments

uute

P.S. thanks for the pics guys, The learnig goes on!

BC21OSH
06-01-2003, 09:55 AM
You don't need dovetail ways on a taper attachment. Many of the quality manufacturers use box ways on their attachments.

Bernard