View Full Version : indexing design

Alistair Hosie
02-26-2011, 04:28 PM
I'd like to make such a disc for both my metal and woodturning lathes how would I go about it.I have some large squares of metal treadplate which I have fly cut and smoothed for just such an occasion.Anyone done this I know John makes them for a living but hey I need to make them bigger and had hoped to try them myself as I am growing slightly in confidence.Alistair ps with old age:D


John Stevenson
02-26-2011, 05:07 PM
Wot diameter?
Wot size hole in the middle?
How many Holes ?

I'll make you one just to stop you posting pictures of your disgusting underpants on the forum................

02-26-2011, 05:11 PM
GO to your local garage and ask them for the old car brake disks ..solid ones

then all you have to do is skim them ..and drill them.

all the best.markj

02-26-2011, 05:14 PM
I have made indexing plates using a worm type indexer and a toolpost drill as shown here:

02-26-2011, 05:22 PM
Alistair, err..., I think you have to get it round first !

Saw to octagonal or better. Hole in centre, and cut to circle.

But the basic problem is that to index to make holes you need to be able to index in the first place. If you make a dividing unit, meaning a worm and wormwheel mounted on the lathe spindle, then you can use a crappy old indexing plate to make a better indexing plate.

So, suppose you have a worm set to give a 1:60 ratio. All you need as a first index plate is a place to park the index arm each revolution and you can make a good 60 hole plate.

Set that plate on your divider and you can make a 360 hole plate.

So you need to start with a worm if you want anything better than three or four holes in your plate.

So either you go for the worm set up, starting with any old secondhand plate, or get the Sheriff of Nottingham to send you one of his leaky beermats.

02-26-2011, 06:04 PM
GO to your local garage and ask them for the old car brake disks ..solid ones

then all you have to do is skim them ..and drill them.

all the best.markj

Better idea, Find some that are cross drilled and hope they did it accurately, and to some usable index count. :)

02-26-2011, 06:18 PM
John, Remember to make em green as well!!

02-26-2011, 06:36 PM
Layout of index plates is described in the Machinist's Bedside Reader, don't remember which of the three.

The Artful Bodger
02-26-2011, 06:58 PM
I have seen a number of ways posted for indexing, including:

Use the teeth of a change gear, if you have a selection of gears you can make a series of index holes etc.

Use the teeth of a circular saw blade.

02-26-2011, 07:07 PM
Most any automotive "speed shop" can sell you an automotive degree wheel that can be adapted to almost any lathe.:)

Alistair Hosie
02-27-2011, 01:19 PM
Sir John before you offer the size might be for the woodlathe about (hole size)75mm approx , and overall size approx 150 to 200 and metal lathe size would be 200 mm hole size and about 245 overall.Is that ok? If your still keen I will discuss it with you no scanties worn:D and you can email me with a decent price for both.Thanks pal ps if you change your mind I'll understand.then it's drawers on at dawn:DAlistair ps if you prefer to make just one then again email me and we can discuss it I am keen on this.John you could make them for woodturners and make a nice little line as they are becoming very popular with us woodheads.Alistair

Alistair Hosie
02-27-2011, 04:29 PM
Hi Johnny what's an automotive degree wheel ?Alistair ok I just looked one up on google got a good free printable version too for anyone wanting it.see here Alistair


02-27-2011, 05:23 PM
be quick ..and count the teeth ..

if its multiples of 12 youre in luck


i make it 50.so no good.

all the best.markj

02-27-2011, 05:50 PM
there you go ..;



as well as 48 teeth it has twelve holes

all the best.markj