Author Topic: The Humble Nudger  (Read 11456 times)

Bogstandard

  • Guest
The Humble Nudger
« on: August 15, 2012, 12:25:26 AM »
Another resurrection post, and if most people have seen it before, please spare a thought for those who maybe haven't.

##########################################################################

This is by no means my idea, I saw one demonstrated a few years back and decided it would go onto my tuit list

Up until now I have used a bit of hardwood mounted into a toolholder, but decided the other day I needed to make a proper one.


The things required were a lump of bar that will stick out either side of the toolholder (if using a QCTP) or you would make it single ended if using a normal toolpost, a couple of reasonable sized ball races, mine were 3/4" diameter, a couple of bolts, mine were 6mm, you need something fairly substantial to take the strain, and a bit of bar to make the top hat spacers from.
The bar was cut down for a nice fit in my toolholder, 16mm square. It was then machined down by the thickness of the bearings and across by about 3/4 their diameter

The top hats were made to a couple of thou longer on the part that goes thru the bearing and the flange was just larger than the diameter on the bolt heads. It was drilled thru the middle 6mm, to fit the bolt. You could use two top hats for each bearing, as long as they didn't meet in the middle. Anything to stop the bearing becoming 'trapped'.

Holes were drilled and tapped 6mm in the position where the bearing didn't quite hit the back shoulder and hung out of the end of the recess, half way across the width of the square bar.

It was more difficult to describe it than make it. Just have it so the bearings stick over the end bit. I also reduced the thickness of the bolt head to about half, just to give a little more room if things get tight.



This is how it should look when assembled.




Mounted in the toolholder, with a bearing either side.

It should be set to centre height when working, but I am showing how it is used.

With the part mounted into or onto the chuck, with the jaws just 'tweaked' tight, the ball race is brought into contact with the face that requires straightening up. With a slight nudge from the tool, the part should move into a much truer running position, then you tighten up the jaws. If say you were holding a disc in the jaws, by nudging, you should be able to get it running fairly true, if not spot on.




By swinging the tool holder the other way, the other ball race can be brought into operation to true up those wobbly bits of metal held in the jaws, before fully tightening up.




Please don't try it with square or hex bar, it won't work very well.


John


Online mklotz

  • Full Member
  • ****
  • Posts: 2402
  • LA, CA, USA
    • SOFTWARE FOR PEOPLE WHO BUILD THINGS!
Re: The Humble Nudger
« Reply #1 on: August 15, 2012, 12:32:53 AM »
"The Humble Nudger" sounds like the title of a Dickens novel.

Humor aside, it's a useful bit of kit.  I made one many years ago and I still use it.
---
Regards, Marv


Home Shop Freeware
http://www.myvirtualnetwork.com/mklotz

Offline rleete

  • Full Member
  • ****
  • Posts: 179
  • Rochester, NY USA
Re: The Humble Nudger
« Reply #2 on: August 15, 2012, 12:49:52 AM »
Huh.  I was just thinking about this last night.  Wondered where I'd seen it, but knew I needed to make one.

You must be reading my mind, Boggs.

Offline b.lindsey

  • Global Moderator
  • Full Member
  • *****
  • Posts: 13594
  • Dallas, NC, USA
    • Workbench-Miniatures
Re: The Humble Nudger
« Reply #3 on: August 15, 2012, 12:56:51 AM »
Thanks for reposting John, i really need to make one too, i can cartainly see how handy it would be!!

Bill

Offline 90LX_Notch

  • Full Member
  • ****
  • Posts: 1405
  • North Eastern Pennsylvania USA
    • YouTube Channel
Re: The Humble Nudger
« Reply #4 on: August 15, 2012, 01:51:15 AM »
An extremely handy tool.  I highly recommend making one.
Proud Member of MEM

My Engine Videos on YouTube-
http://www.youtube.com/user/Notch90usa/videos

Offline KB

  • Full Member
  • ****
  • Posts: 153
Re: The Humble Nudger
« Reply #5 on: August 15, 2012, 04:30:42 AM »

A handy tool indeed.

Mine was made by turning down the end of a piece of hex bar to press into the inner race. The tool is held 90 degree's to how you have shown it. Just another option for potential builders.

Bogstandard

  • Guest
Re: The Humble Nudger
« Reply #6 on: August 15, 2012, 09:05:57 AM »
Gents, many thanks for replies and suggestions.

Give people an idea, and they will come up with their own way of making it, and none of them are incorrect if it does the job.
I just wish that there was a hints and tips board when I was going through my knowledge gathering years. Everyone who puts a post into this section is making life easier for those who follow.

As I said, before I made this simple bit of tooling, I used a piece of hardwood, which worked extremely well for many years, but now I have this super efficient one, I find I am using it almost every time I use my self centring chucks.
 
It is one of those tools that makes life a lot easier, and you wonder how you ever managed to do things without it.

John

Offline iRon

  • Full Member
  • ****
  • Posts: 5
Re: The Humble Nudger
« Reply #7 on: August 15, 2012, 11:21:18 AM »
Thank you very much for this brilliant idea. It will fill a need I did not realiose that I had!

Ron

Online steamer

  • Global Moderator
  • Full Member
  • *****
  • Posts: 10257
  • Central Massachusetts, USA
Re: The Humble Nudger
« Reply #8 on: August 15, 2012, 11:25:55 AM »
Nice one John!   I too used the back of a tool shank.....just added to the "Tuit" file.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline rleete

  • Full Member
  • ****
  • Posts: 179
  • Rochester, NY USA
Re: The Humble Nudger
« Reply #9 on: August 19, 2012, 02:13:05 PM »
I finihsed mine last night.  As the UK members would say, "it works a treat".

Because I didn't have a spare tool holder, but I did have a spare boring bar holder, I made mine round.  Instead of all the chamfers, I rounded over the ends of the bar by hand with a file.

Online steamer

  • Global Moderator
  • Full Member
  • *****
  • Posts: 10257
  • Central Massachusetts, USA
Re: The Humble Nudger
« Reply #10 on: August 19, 2012, 02:15:53 PM »
Pictures please!.... ;D
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline rleete

  • Full Member
  • ****
  • Posts: 179
  • Rochester, NY USA
Re: The Humble Nudger
« Reply #11 on: August 19, 2012, 02:48:53 PM »
Just for you...




It's in 2 pieces because the boring bar holder is a 3/8" bore, and the bar I had was 1/2"  those are #10-32 x 5/8 Button socket head screws in stainless. 

Online steamer

  • Global Moderator
  • Full Member
  • *****
  • Posts: 10257
  • Central Massachusetts, USA
Re: The Humble Nudger
« Reply #12 on: August 19, 2012, 06:30:25 PM »
Awesome!

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Mayhem

  • Full Member
  • ****
  • Posts: 14
Re: The Humble Nudger
« Reply #13 on: August 20, 2012, 04:14:20 PM »
I thought I would add my own variation.

Not wanting to use up a tool holder and only having one bearing on hand at the time (I'm sure I'm not the only one who decides to build things on a Sunday afternoon!).

Some scrap plate and round stock welded up to fit the dove tails on my QCTP.  The bearing arm pivots and locks in along the centre line, allowing for use in both directions.

Don't laugh but the bearing is missing from the photo, as I had to put it into my grinder shortly after making it and before I took the pictures!  A suitable bearing has since been found and bolted in place.

Bogstandard

  • Guest
Re: The Humble Nudger
« Reply #14 on: August 20, 2012, 08:18:42 PM »
It is like everything else on here, show an idea, even if it came from somewhere else, and people will make the bits out of whatever they can get hold of, and they will all do the job admirably.

Real nice build lads :NotWorthy: :NotWorthy: :NotWorthy:

John

Offline KB

  • Full Member
  • ****
  • Posts: 153
Re: The Humble Nudger
« Reply #15 on: September 20, 2012, 09:21:35 PM »

Had mine out the other day;




Online Jo

  • Administrator
  • Full Member
  • *****
  • Posts: 12547
  • Hampshire, england.
Re: The Humble Nudger
« Reply #16 on: September 20, 2012, 09:31:07 PM »
Sadly :disappointed: a nudger is still on the "must make list".

Jo
Usus est optimum magister

Arbalest

  • Guest
Re: The Humble Nudger
« Reply #17 on: September 20, 2012, 09:40:24 PM »
Sadly :disappointed: a nudger is still on the "must make list".

Jo

+1 ;)

Online steamer

  • Global Moderator
  • Full Member
  • *****
  • Posts: 10257
  • Central Massachusetts, USA
Re: The Humble Nudger
« Reply #18 on: September 20, 2012, 10:38:06 PM »
That one is the simplest I've seen so far!

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline rleete

  • Full Member
  • ****
  • Posts: 179
  • Rochester, NY USA
Re: The Humble Nudger
« Reply #19 on: September 20, 2012, 10:44:50 PM »
I had been meaning to make one for quite a while -ever since Bogs first showed it on another forum - and finally got around to it.  Glad I did, it's a real timesaver.  Sure beats the old method of setting up the indicator, spinning the chuck, tapping the part, spinning the chuck, tapping the part again...

Online steamer

  • Global Moderator
  • Full Member
  • *****
  • Posts: 10257
  • Central Massachusetts, USA
Re: The Humble Nudger
« Reply #20 on: September 20, 2012, 10:54:17 PM »
I've used the back of a boring bar as a nudger....but it eventually scars the part....and if your chuck is too tight to start it can scar it bad.

The bearing is the way to go.

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!