what nut is that?

**Godzilla98** · 27th November 2009, 08:01 PM

I'm doing a little refurb on a Mc Millan pedastal drill I secured. I'm hoping the main shaft may be the same as my Mc Millan clone - which is bent - only a bit but it makes accurate holes a bit of a challenge.
.
Getting it apart has been fun and involved building a couple of "special" tools.

This raised the question as to just what these nuts are called. The first is a 15/16 lock nut used to secure the main drive pulley on top of the shaft. Looked like it could be managed with a "c" spanner (I think) but being down in the well of the pulley meant you could not access it. so tool #1 was created.

My question is what is its correct descriptive title?

The second is the lock nut attached to the front of the handle of the cross slide on my Hercus. Being just a little stubborn I have had to create a tool to grab both sides of the nut over the shaft to undo it.

So again what is its correct title.

I'm sure there is a source of identity out there but as yet beyond my searches or discussions.

And of course are there tools designed for these nuts.

Anyway back to the demoltion... and by the way what is the best penetrating fluid you've found for freeing up seized "things" on shafts.

Ian

**Godzilla98** · 27th November 2009, 08:05 PM

This might help...[IMG]file:///E:/DCIM/100CANON/IMG_1659.JPG[/IMG]

**pipeclay** · 27th November 2009, 08:16 PM

If you look for Lock Nut or Shaft Nut for your spindle,most of the time they are usually UN threads or Metric.
The other for the Cross Slide and Compound Slide for your Hercus are probably made to suit the application ,I dont recall seeing them in any catolouges.

**pipeclay** · 27th November 2009, 08:19 PM

The tool for the Lock Nut would probably be available but it would probably be cheaper to make a Tube Spanner with the Correct spaced fingers to locate in the slots of the Nut.
In regards to the Hercus Nut most people either make a suitable tool or modify a Flat Bladed Screwdriver.

**Godzilla98** · 27th November 2009, 08:34 PM

Thanks Pipeclay,

I did follow those lines and am now short a wide blade screwdriver, but I doubt it was ever going to be a tool to rely on....

And I think your right - hercus would have had a bin of their own inhouse retainers. Not something you'd be likely to find at bunnies or repco.

I was really more curious as to what they would be described as.

Ian

**kwijibo99** · 27th November 2009, 10:11 PM

G'day Godzilla,
The best penetrating fluid I have ever used by far is Wurth Rost Off, this stuff is absolute magic. I restore old ststionary engines and this stuff has penetrated and allowed me to undo nuts and bolts from engines that have been at the bottom of a river for 60 years.
Its a bit on the expensive side but worth every penny I rekon.

Wurth Australia Pty Ltd - Catalogue

They also make the best hand cleaner I have ever used.

I don't think you can buy their stuff in shops as they supply direct to trade but you can just ring them and order on the phone and they deliver it.

P.S I have no affiliation with this company.

**neksmerj** · 28th November 2009, 02:38 PM

GZ98,

Rather than destroy a perfectly good screw driver, to tighten the domed, slotted nuts on the Hercus, I simply cut a plain washer in half, and gripped it with a pair of pliers. The washer was about 6.5mm ID x 1.2 thick.

Ken

**Godzilla98** · 28th November 2009, 10:40 PM

Thanks for your info kwijibo99 - I do have access to their product - I'll give it a go. I've used the white vinegar trick from Bitza500 with success on other stuff but these gears are pretty seixed.

And Ken - great idea with the washer _ must try that, but trust me it was not a very good screwdriver - but at least I got the nut off.

Thanks all

**steran50** · 30th November 2009, 09:58 PM

HI,
Referring to the Picture on the Left, I can't remember the Name of the Tool. I haven't seen one with only two slots though. They generally have 3 or more Slots. These type of Nuts are often found on Chainsaws, Lawnmowers, Outboards etc. A way to make a Tool up for it is to get a Piece of Black Pipe of the right size, Square the ends off. Sit it on Your Nut, then Mark out on Your Pipe what needs to be Cut away and what doesn't. Now do the Cutting on the Pipe to leave the two Legs. To turn the Pipe to undo the Nut, get Yourself an Old Socket and Weld it to the other end of the Pipe. Hope this helps.
All The Best

steran50 Stewart

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