Another new project... a QCTP (Quick Change Toolpost)

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AdeV:

--- Quote from: bogstandard on September 20, 2010, 08:39:23 PM ---Ade,

I meant to show you the adjusting bits I made for my tool holders when you called yesterday.

Instead of making a washer to go under the nut, just get a length of bar the same diameter as your 'washer', knurl the outside for a few inches (50 to 75mm), then drill and tap the same thread as you are using. Part them off to about 3mm thick whenever you want a new length adjuster. Once it is screwed onto the thread for exact height, your nut is then used to lock it into position.

Like shown in the last few pics of this post.

http://madmodder.net/index.php?topic=2323.msg24924#msg24924

--- End quote ---

Hi John - I'd planned to do something pretty similar to that - I don't have a knurling tool yet, so I was going to use the dividing head on the mill + a ball nose cutter to make a sort of revolver chamber effect. I was going to use brass, but I've only got 6mm, 12mm and 1.75".. so I think I'll just use some of that bar you gave me for now.

The "washer" I made is actually drilled/tapped to thread onto the stud; the reason I didn't turn one was because I didn't have the use of the lathe at the time.... Now I can mount stuff more or less straight, I can do it proper...

lordedmond:
OT for this thread

AdeV did you ever get that tap out of the dry sump build ?

if so how

Stuart

AdeV:
Hi Stuart,

Nope, they're still (mostly) in there. I seem to have generated an awful lot of rusty foam, and bugger all else....

Look out for more progress on that thread soon (I needed to finish this project off first, if only so I have a project I can actually called "finished"!)

I'm probably going to do something John (Bogs) suggested, and drill round them with a hole cutter, and instead of drilling/tapping I'll just glue pins in. Maybe with a screw in piece at the top just to act as a retainer, although that's probably not strictly necessary, if I make the pin slightly tapered at the top end, and use my Big Plastic Smacking Hammer to fit it...

lordedmond:
thanks sorry for the OT

AdeV:
No problem Stuart - I frequently go off-topic myself, usually in the middle of a sentence, or post...

Anyway; tool-holder time. I did say I wasn't going to do a build log of these, but I find I can't help myself... Oh well, at least you get to suffer too...

So, I scored a nice lump of tool-holder-style metal - 3"x2"x1 metre. Which is great, except I needed 3.5"x2"xmetre - damn! 3" doesn't leave enough meat around the root of the dovetail; so Plan A (cut long dovetails down the 3.5" side, then "part off" toolholders to the desired height using the hacksaw, as required; went straight out of the window. Instead, I had to cut the bar into 3.5" lengths, each of which is now 3" high & 2" thick. Hey ho, them's the rubs.

Poor old Manchester the Hacksaw has been working overtime today, although I did treat him to a new blade. Here's a bunch of freshly cut blocks:

Each one was then treated to a squaring cut:

The surface finish may be lousy, but when stood on a single parallel it pretty much guarantees that the bottom is dead nuts square to the back jaw face; so when I skim the top face, it'll be nicely square & true with the same face. So when I flip it over & properly skim this side, it'll also be square & true. That's the theory, at least...

By closing time tonight, I'd got this far:

2 rough, 5 with just the single true-ing cut, 2 with one face finished. There is the tiniest of ridges (can be heard when running a fingernail in one direction across the finish), so just a smidge out of tram. Nothing the file won't cure.

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