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View Full Version : Tailstock tap dohicky



Tinkerer
02-11-2005, 03:49 AM
I do some hand tapping in my lathe... Normally I'd put the tap in a chuck in the tailstock line it up and use a tommy bar to rotate it. It works ok but never like the taper turning it the ram. Anyway I decided to make a dohicky to replace the #2mt on the drill chuck. So yesterday I took a piece of 3/4" round and turned a #2 MT on one end and a 1/2" shank 2 1/2" long on the other. Then chucked up a piece of 1 1/4 x 4 1/4" round scrap that had a been turned down to 3/4" on one end and turned a JT-3 taper on it to take a 5/8" drill chuck. flip it over center it and trued it to the JT-3 taper. I then bored a 1/2 hole 3" deep. Then I bored the end out to press fit a 1/2" x 1 1/2" a bronze bushing. Pop on a drill chuck slid in the MT shank into the ram and slipped on the dohicky... chuck up a tap and gave it a try. Works great... tolerance it so close between the shank and bushing it has a air spring effect that helps keep the tap faced with the hole I'm sure in time it'll loosen up... but I planned for that and will place a spring inside. I'm truly thrilled with it. I still need to cross drill it for the bar. But just had to give it a try. First MT taper as well... fit like a glove. http://bbs.homeshopmachinist.net//smile.gif

Tim

[This message has been edited by Tinkerer (edited 02-11-2005).]

SGW
02-11-2005, 07:37 AM
Sure is nice when things work out as planned, isn't it? Especially tapers -- doing a good taper can be decidedly non-trivial.

shaque
02-11-2005, 07:51 AM
pics!

G.A. Ewen
02-11-2005, 08:15 AM
Does yours look something like this?

http://img.photobucket.com/albums/0603/GAEWEN/Tools%20and%20Machinery/18898be8.jpg

http://img.photobucket.com/albums/0603/GAEWEN/Tools%20and%20Machinery/3ca72bb4.jpg

http://img.photobucket.com/albums/0603/GAEWEN/Tools%20and%20Machinery/77f1358e.jpg

I haven't got round to making one for my lathe yet but it is sure handy in the drill press. Can you post photos of yours?

Tinkerer
02-11-2005, 11:59 AM
SWG... Yes your right.. it is cool when it all comes together and works as well as you imagined it would.

G.A. Ewen... Dead on in function. Very Similar in design cept my shank is on the #2mt. I'll snap some photo's of my old scrap... turned into my new dohicky. http://bbs.homeshopmachinist.net//smile.gif

Umm most of you use photobucket... I'll have to open a file there... So it'll be a bit.

Tim

[This message has been edited by Tinkerer (edited 02-11-2005).]

Tinkerer
02-12-2005, 09:19 PM
Ok here it is.
http://img.photobucket.com/albums/v665/A-Tinkerer/000_0247.jpg
http://img.photobucket.com/albums/v665/A-Tinkerer/000_0249.jpg
http://img.photobucket.com/albums/v665/A-Tinkerer/000_0250.jpg
http://img.photobucket.com/albums/v665/A-Tinkerer/000_0252.jpg

G.A. Ewen
02-12-2005, 10:21 PM
Yup, same thing but different http://bbs.homeshopmachinist.net//biggrin.gif

IOWOLF
02-13-2005, 07:59 AM
Tinkerer, is that an atlas 10" in your pic.?

Tinkerer
02-13-2005, 10:28 AM
G.A. Ewen.. Yep same but different.

IOWOLF... Ding Ding... we have a winner. You sure know your weys around a lathe. It's a 10FTH42 to be exacted. An oldie but a goodie. I also have it's little brother a 109 as well.

Tim

Dr. Rob
02-14-2005, 04:57 PM
Handy little item. Had one planned for the lathe, when I noticed that all you need to do is crank the tailstock barrel forward until it comes off its thread and/or key. Then the barrel slides freely in the tailstock casting for a couple of inches.

Still might need one for the drill though. Thanks for the reminder.