4 way tool post holder

[tanii51]

Will this fit my model C http://cgi.ebay.com.au/4-WAYS-METAL-LATHE-TOOL-POST-HEAD-NEW_W0QQitemZ260372734610QQihZ016QQcategoryZ105828QQcmdZViewItemQQ_trksidZp1742.m153.l1262C

[Grahame Collins]

It depends on shaft size given at 18mm and the center height,

Whats the center height of your machine?
Grahame

[pipeclay]

As it is no,the base plate thickness is normally around 14mm (the bit that sits on your compound),
if the block is machineable you can face it off to suit.
The diameter of the hole will not be a problem.

[tanii51]

haha i see now so the bottom would have to be machined off to 8mm thick which is the same as the original lantern type tool post spacer.
will this weaken it to much
is this possible bearing in mind so far i have only a 3 jaw juck

i may be able to get my nephew to do a freebie for me at his work place

[pipeclay]

Dont machine it to 8mm that will make it to short.

The size of 14mm thickness is about right but not exact,if you are going to use 1/2" tool steel or a carbide tipped indexable tool you will have to know the centre height of the tool before you machine the base.

One way of checking the centre height is to set your Lantern tool post holder on centre,If you have a dead centre place it in your headstock spindle and set the tool on centre.

Then measure from the tip of your tool to the flat section of your lathe bed (should be 4 5/8").

Once you know the centre height of the tool then remove the Lantern tool post and measure the distance from the top of your compound slide to the flat section of your lathe bed,take this measurement away from your centre height.

This will give you the thickness of the tool post base to get the top edge of the bottom of the base on centre.

This measurerment might be around the inch or 25mm mark,now you need to decide what type of tool you are going to use (i would suggest 1/2" but the choice is yours,just rember you can allways pack a tool up to the correct centre height rather than bring them down)

Once you have decided the type of tool you are going to use Subtract this from the Previous measurement (inch or 25mm) and this will be the required thickness of the base.

[blackfrancis]

It's a little too big. As for machining the bottom off, keep in mind that it is probably case hardened.

[neksmerj]

Hi tanii51,

Have a squize at http://cgi.ebay.com.au/4-POSITION-TOOL-POST-FOR-METAL-LATHE_W0QQitemZ370159970601QQihZ024QQcategoryZ92083QQcmdZViewItemQQ_trksidZp1742.m153.l1262

Hercus under their eBay name of fw444400 are selling the body of a 4-way tool post right now for Buy it Now $35. You would only need to buy some screws, make a tee-nut, and the tightening handle.

At $35, it's a bargain for the genuine article, oops, maybe not, didn't realise the postage was also $35.

In case the above link doesn't work, the item No. is 370159970601.

Ken

[blackfrancis]

Unfortunately it's for a considerably bigger lathe, not the nine inch :(

"DIMENSIONS ARE
4.25" X 4.25" SQUARE
3.125" HIGH
1.750" BORE
SUIT .750 LOCKING STUD
1/2" WHITWORTH TOOL LOCKING THREADS"

Ideally you want 2.5 x 2.5 square for the 9"

[tanii51]

hmmm how about i make one say 2x21/2"x1/2 plates with round say 1" in between with hole bored thru the middle would it have to be hardened

[neksmerj]

Oops, I misread the eBay description, my opologies.

In the next couple of days, I will draw up the tool post assembly from my 9" Hercus.

Schidt happens,

Ken