Woodturning Chucks Australia,woodworking plan dining table,Pinewood Designs,Wood Files And Rasps - Try Out

14.04.2013 admin
The Longworth chuck was developed in the late 1980’s by Leslie Douglas Longworth of the Hunter Valley Woodturners in Australia. Once the faceplate is attached to the disks put it on your lathe and turn the disks perfectly round, removing as little wood as possible to maximize the size of the chuck.
Because of the size and weight of the chuck, and also because I am just using it to finish off a bottom of a piece I usually use it with a speed of between 500 and 600 rpms, though I have had it as high as 750 rpms.
Also, the April 2010 issue of Woodturning magazine has an excellent tutorial which I followed pretty much verbatim. The other picture shows a Patriot chuck with one dovetail jaw removed to show the mounting jaw at A. You might imagine that all that is necessary with any chuck is to push the piece of wood into the chuck jaws and tighten up.
Wood is a weak, soft material compared to metal and, to grip it securely, the chuck jaws must clamp over a large surface area.

A fellow turning club member is wanting to get together with me to build a couple Longworth chucks so maybe we’ll find some suitably flat material. The faceplate will be permanent so you need to get one specifically for the Longworth chuck. Sometimes on budget chucks the scroll is pulled round using tommy bars to open and close the jaws. Scroll chucks designed for woodturning have four jaws (metal turning ones are generally three jaw) so it is possible to grip square section wood.
The chuck jaws have a dovetail on the outside so that they can be expanded to grip the inside of a dovetail shape recess in the base of a bowl.
Very good article by the way, a little hidden gem in the midst of a google search for ‘homemade chuck’!
Better yet, if you turn a tenon on the faceplate you could simply chuck it instead of threading it on to the lathe’s spindle.

On better chucks there are small pinions or bevel gears which engage with gear teeth on the reverse of the scroll. Then I tighten the wing-nuts and follow this up with more tightening using a wrench when the chuck is mounted on the lathe. However, one thing to keep in mind is that these types of chucks are primarily used to finish the bottom of a project and not for any heavy turning. So for maximum grip you have to turn the spigot (a short tenon or projection) to the correct diameter and dovetail angle to suit the jaws of your chuck.

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