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Indexing facility on woodturning lathe?

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Forum topic by SCOTSMAN posted 12-21-2010 08:50 PM 3968 views 0 times favorited 11 replies Add to Favorites Watch
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SCOTSMAN

5839 posts in 3051 days


12-21-2010 08:50 PM

When woodturning I have the indexing holes 24 of them built into my chuck backplate.I would like to ask how you guys lock your spindles for indexing, as I intend to do this a lot during the coming year.I am not impressed with the buyable arm with a pin as I consider it too flimsy to hold the chuck securely for anything but the lightest small cuts please let me have your ideas?Alistair

-- excuse my typing as I have a form of parkinsons disease


11 replies so far

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Dennisgrosen

10850 posts in 2581 days


#1 posted 12-21-2010 09:12 PM

isn´t there a build in lockingtype device already
a handle in the bottom of the endexing wheel

Dennis

Edit : stupid me you said the backside of the plate
not on the other side of the engine Sorry Alistair

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Jamie Speirs

4167 posts in 2322 days


#2 posted 12-21-2010 09:18 PM

Alistair, mine is a cranked barrel bolt.
A bit crude but it works on my union graduates.

Jamie

-- Who is the happiest of men? He who values the merits of others, and in their pleasure takes joy, even as though 'twere his own. --Johann Wolfgang von Goethe

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SCOTSMAN

5839 posts in 3051 days


#3 posted 12-21-2010 09:24 PM

NO Dennis not on my lathes the two larger ones in question have just had new chucks bought for them ,the idea being that instead of having two different chucks with different associated jaws I have a complete set of accessory jaws which will do for both lathes. I have bought the axminster super precision jaws sold here in the UK these have back plates with different threads which suit each of my lathes actually only one of my lathes as I could not get on anywhere to fit my big ex copy lathe which is a professional industrial lathe without the copy attachment. I have bought a set of jaws with smaller than needed spindle hole which I am in the process of converting or having converted to suit my lathe. These jaws will then apart from the spindle thread sizes and jaws fitted at the time to suit , be fitted with each a back plate these are complete with a series of holes drilled into the top portion of the back plate to use for indexing axminster sell a flimsy looking arm device with a pin in the end which I figure will not be as secure as I would wish. Anyway I Intend to make my own from a suitable plan so as said if anyone has done this or can point me in the direction of a better more suitable secure fixing for this please advise kindest regards Deniss and thanks for kindness shown to Bronwen you’re truly an extremely nice guy. Alistair ps see here

http://www.axminster.co.uk/axminster-axminster-super-precision-woodturning-chuck-prod809379/

-- excuse my typing as I have a form of parkinsons disease

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Dick, & Barb Cain

8693 posts in 3765 days


#4 posted 12-21-2010 09:39 PM

My old Craftsman vintage 1940s has an indexing pin built right in, that locks the drive pulley.

I looks like your indexing wheel is built pretty husky. The strength of the pin needn’t be very strong, because you use it mostly for routing flutes. The pin just needs to hold it in place. There should be very little stress in this process.

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

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Dennisgrosen

10850 posts in 2581 days


#5 posted 12-21-2010 09:43 PM

thank´s for the kind words Alistair
correct me if Iam totely wrong here with the idea

the lathe I tryed 35 years ago had this heavy breake arm well just think heavy :-)

if you secure an arm like the way your toolrest is lock to the lathe
and this arm function is like a seesaw the children play with so it is in the topposition
when the arm is locked down in the front of the lathe with a shooting dovel or similar
that wuold lock the dovel in a hole from down under in the indexplate

Dennis

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SCOTSMAN

5839 posts in 3051 days


#6 posted 12-21-2010 09:59 PM

It’s not the pins , I am worried about at all Dick .I don’t want these at all primarily for flutes I am embarking next year on a pretty big project on my own of indexing bowls and platters and incorporating all sorts of routing designs into these which will be filled re-routed refilled etc and include wood plastic metal etc including metal castings .I have been thinking of this process for several years.
Whereas normally I make usually a bowl or two in a day I will be much more caring re artwork and design this is difficult to explain but I am going to embark on a large woodturning bowl turning Art project taking my time a bowl might then take me a week or two or more to complete.
I will be using all sorts of artistic ways of embellishing my turning. I need to make a complete engineered device for holding the router and making all sorts of cuts into the bowls etc from all angles sometimes completely cutting great chunks from a bowl and replacing them it’s really not easy to explain all my ideas I have decided to carry out in a few minutes the engineering alone might take a month or two as I want a free flowing arm to hold the router to travel in an arc etc etc etc, as you know I have a fully fitted out machine shop as well as wood..Sorry I don’t mean to rant just excited at the thought of years of planning coming into effect anyway I digress the indexer might be better built in a half circle overlapping the top half of the chuck with a braking system as Dennis suggests to hold the chuck very firm for the heavy cuts I envisage making sorry if this is not making sense,but the chuck has to be indexed accurately and firmly. Alistair

-- excuse my typing as I have a form of parkinsons disease

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Dennisgrosen

10850 posts in 2581 days


#7 posted 12-21-2010 10:39 PM

sorry for my bad english Alistair and only the explanation to the arm
beside the arm I was thinking of a having a triangle welded on with a little top angled 90 degree
with a hole just sitting belove the indexplate
thrugh the hole and down to the arm there is attach a pistontype pind that match both
the indexplate hole and the hole in the plate on the triangle
well I gess if I had a scanner to this PC it wuold be easyer to show than explain

Dennis

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SCOTSMAN

5839 posts in 3051 days


#8 posted 12-21-2010 10:46 PM

I am trying my best to visualize yiour plans Dennis.Actually it sounds as though you might be on the right track if I have understood your design properly I like the piston idea.Dennis you may understand why I don’t get over enthused about the current design sold as an indexing arm with apin attached the pin is neccessary but the flimsy arm is too liable to lateral movement when heavier cuts are in volved many thanks my dear frienmd.Alistair

see here

http://www.axminster.co.uk/axminster-axminster-indexing-arm-prod22386/

-- excuse my typing as I have a form of parkinsons disease

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Dennisgrosen

10850 posts in 2581 days


#9 posted 12-21-2010 10:54 PM

huu that one looks skinny and the plate at the end is too little as I can see
even if it was possiple to atach it to the lathe on a 90 degree angle
and the pind looks like there wood bee sloop between it and the index hole
understandeble why you try to find another solution
as I said think haevy like a breake arm always seems to be on bigger lathes if they have them
just remember I have only used a lathe a few times and its 35 years ago :-)

I will see if can get near a scanner tommorow with a raw sketch for you

Dennis

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reggiek

2240 posts in 2736 days


#10 posted 12-22-2010 12:45 AM

My Powematic has an indexing screw and the internal shaft has ports to tighten the screw into. I have used this several times without any problem…but I use a shop made fluting jig for fluting turned items….mostly I use the indexer for scribing the lines and for making equidistant scribe lines for other designs.

It is better to use fluting jig for fluting turned items…It clamps on to the lathe bed and has a slot that you can sight along for where the flute will cut. Then you can either stop the lathe shaft…Mine has a clamp built into the jig. The built in clamp is much more robust than the ordinary indexing wheels on most lathes.

From what I can make out of your plans is that you want the indexer to basically act like a lathe vise…I do not believe that is the intent of indexing wheels….I would recommend that you design something more substantial…being a machinist…I am sure you know how easy the shaft on the lathe can be burred, bent or have the slots torn out. You are probably the better qualified to decide if you will be taking that kind of chances.

-- Woodworking.....My small slice of heaven!

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Dick, & Barb Cain

8693 posts in 3765 days


#11 posted 12-22-2010 03:33 PM

I’m sorry, but I misunderstood what your intended use was for.

It sounds like you have in interesting design problem to solve.

I think a small hand held router, or die grinder should work well for this.

You could probably use a tool rest similar the one pictured as a starting point to attach your router to.


This heavy duty free standing tool rest support of cast iron construction is great for use with lathes with an outboard turning facility such as the Jet 4224. This also includes lathes where the headstock can be slid along the bed to the tailstock end allowing very large diameter projects to be undertaken. The 1442, 1642, and 3520B Jet lathes all have this facility. Designed to accept a 1” tool rest stem, the working height range is from 1,000mm to 1,240mm above the floor.

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

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