Oval jig

[winemaker]

Found this and thought it was interesting https://www.youtube.com/watch?v=WE57RMsNB1M

 

[woodfarmer]

Bit disappointing, I was hoping to see how the jig was made. I did notice his toolrest had lots of clearance. Has given me an idea.

 

[CHJ]

If you search Oval Turnings on the forum you will come up with several links.

One of which is here:- by " Ad de Crom" who is a great exponent of Oval turnings.

improvement-for-my-oval-turnings-t45036.html

Ad de Crom has not posted since june 2011 but was still visiting the forum as of dec 2013.

 

[Roger C]

A very good friend of mine here in Pretoria does eliptical turnings 300 mm deep vases on a oliver lathe with a eliptical chuck which he made. Unfortunately he is not o fay with computers. I will ask him to make a short video and I will post it on this site.

 

[SVB]

I think vicmarc did a oval jig some years ago- expensive iirc (£1500+). A lot of engineering in it (toothed belt driven cams and linear slides) so doubt they made much on each sold given limited volume. Interesting and perhaps something someone like AWGB etc could buy / rent etc but other than that.......

Simon

 

[J-G]

This is my first post so hope I don't offend any rules - I have viewed the guide-lines but you never know!!

I came across David Springett's video about 3 years ago and was disappointed to find that his book with plans was out of print. Seldom undaunted, I did more research and found Volmer and Holtzapffel which only fired my imagination further but didn't provide sufficient detail to set about building a 'chuck' to suit my Myford Super7. What I did find was a sketch of the basic principles involved, so from that I set about designing a 'device' from scratch. After many iterations and much head-scratching I was 'over-the-moon' when last week I drew an ellipse with a felt-tipped pen (on the lathe).

There are still problems to be ironed out but MkII of the work holding part is now well under way and I've produced two items.

The images of the chuck itself are taken with it dismounted from the lathe.

 

[J-G]

MkII of the 'chuck' is now in use and is so much better. I now need to work on MkII of the back plate which will provide screw adjustable eccentricity. A SketchUp file could be made available should anyone have an interest.

Two more pieces made : another Pill-box in Olive plus a Cameo Broach in Walnut and Mother of Pearl. This will eventually have an Ebony silhouette of my grand-daughter cut into the MoP.

 

[dickm]

Brilliant - looks like a really good design and well executed. Oval work from a lathe always intrigues.

 

[monkeybiter]

A SketchUp file could be made available should anyone have an interest.

I for one would be very interested to see the details of your method. The results look very good.

 

[J-G]

A SketchUp file could be made available should anyone have an interest.

I for one would be very interested to see the details of your method. The results look very good.

It seems that I don't yet have the rights to send PMs - or I haven't yet discovered how - nor can I see an e-mail address for you MIke.

The SketchUp file is 15Mb so I've put it on my web-site - I put the URL here but it seems I'm not allowed to post links nor attach a file with my web-site details so I need some advice as to how we can exchange information - - -

There is only one file on the site at the moment so you can't miss it - I've closed up all the components so that you can see the 'chuck' in its working position, to see the 'inner workings' you'll have to pull them apart

I assume that you already have Google SketchUp so as long as it is at least Version 8 you should be able to open it.

 

[monkeybiter]

All sorted, thanks J-G

 

[paulking]

I am intrested in finding out more about this too Please,
Paul

 

[paul-c]

hi j-g
i also would be interested in making one of these.
thanks for sharing
paul-c

 

[procell]

Likewise J-G
I only have access to basic power tools like drill, router table and band saw. Would it be possible to build it with these basic tools?
If it helps you can probably put your web site on here if you do not include anything up to and including www.
ie: ukworkshop.co.uk/forums/oval-jig-t76660.html?sid=1f76f4447165216226e2601deb1d820c

 

[J-G]

Likewise J-G
I only have access to basic power tools like drill, router table and band saw. Would it be possible to build it with these basic tools?

I think you would have some difficulty without access to even a small 'mill' - I have a Proxxon - but I also have a Myford 7 which is permanently set up as a Horizontal Mill with a vertical slide. And there are many turned components which require a high degree of accuracy - the 115mm ball race in particular - which I doubt could be done free hand on a wood turning lathe - for the self-centreing chuck you would need Right & Left-hand threads. Although 'allthread' is available I had to buy left-hand taps because a simple nut wouldn't do the job.

Now that I have done more than the minimum posts I should be able to post the web URL - I'll leave the www off
special-time.co.uk/drawings
there is only the one file there so you can't miss it.

JG

 

[bugbear]

I have a design for an oval chuck in one of my old (circa 1900) books - would people be interested in a period piece?

I'd also have to find the right book ...

BugBear

 

[bugbear]

Here we go, circa 1900.

BugBear

 

[monkeybiter]

Good description, thanks.