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Instruction/Data Sheet
In this booklet we will take an in-depth look at the
component parts and make 4 different projects. The four projects are of varying complexity and use all
of the Eccentric Chuck's various holding methods.
The first project will be an Off-set Stem Goblet. The second will be a 3 sided bowl with a cloverleaf
centre detail. The next will be a Cabriole Candlestick and we will finish this presentation with a
scallop lidded box.
Robert Sorby
The
Eccentric Chuck uses three methods for holding the wood.
These are :
1.
Screw chuck
2.
Faceplate
3.
Hexagonal Ball drive and socket.
Robert Sorby
The
Eccentric Chuck is the most comprehensive multi-centre chuck available.
The unique eccentric boss provides easy and accurate adjustment with its bi-heaxagonal locating
socket for each of the holding components. This allows for each component to be located at any
of the 12 positions.
The eccentric boss is marked 0-35 on its outside diameter, which can be seen through the viewing
window in the main body.
These markings are the amount the holding component held in the eccentric boss can be offset
from centre.
Zero being on the centre axis of the lathe. At this position the work piece will run concentrically to the
rotatation of the lathe.
Any number other than zero will then offset the work-piece by the amount shown in the viewing
window. The combination of the amount of offset of the eccentric boss & the position in the
bi-hexagonal socket means this is the most versatile Eccentric Chuck available.
Robert Sorby
The
Eccentric Chuck weighs around 51/2 lbs (2.5kgs). It is designed this way
to counterbalance the weight of the work piece when it is offset. This gives more stability than any
other offset system where the main components are offset from the centre as well as the work piece,
adding far more weight and creating a greater imbalance. This would substantially reduce its capability
increasing the risk of damage or injuiry.
Using and insterted adaptor system with a large variety of thread sizes the
Eccentric Chuck can be fitted to virtually any lathe in the world.
The insert, screws into the main body of the chuck and is tightened using the large wrench supplied.
The chuck can be easily mounted onto the lathe and is tightened using the wrench supplied.
Robert Sorby
The
manual. It describes the chuck and its component parts as well as instructions how to use each of the
holding methods. A CD video to accompany this booklet is also available. It shows all the procedures
described with full step by step commentry.
Robert Sorby
Eccentric Chuck is also supplied with comprehensive 12 page instructional
Page 1
Eccentric Chuck with all its
Robert Sorby
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Summary of Contents for Robert Sorby Eccentric Chuck
- Page 1 Eccentric Chuck available. Robert Sorby Eccentric Chuck weighs around 51/2 lbs (2.5kgs). It is designed this way to counterbalance the weight of the work piece when it is offset. This gives more stability than any other offset system where the main components are offset from the centre as well as the work piece, adding far more weight and creating a greater imbalance.
- Page 2 Robert Sorby Eccentric Chuck is a precisely engineered product and should be well maintained. When not in use keep the chuck and all its components clean and store them in a carry case provided. A thin film of light oil or silicon spray will keep all parts in top condition.
- Page 3 Page 3 Instruction/Data Sheet Place the eccentric boss into the main body and rotate it so that ‘0 is visible in the sight window. The wood will run concentrically at this position and retighten the eccentric boss screws. Carefully screw the wood onto the screw-chuck making sure it is tight against the body of the chuck and inline with the lathe.
- Page 4 Page 4 Instruction/Data Sheet Sand and finish the base with the desired finished. Now the completed goblet can be removed from the waste wood using the parting tool. Ensure that when you part off it isn to the right hand side of the original safety mark. *Be careful when parting off that the goblet does not come loose.
- Page 5 Page 5 Instruction/Data Sheet Three sided bowl with a Cloverleaf centre detail The second project we are going to make in the presentation is a 3-sided bowl with a clover leaf centre. We will use a bowl blank of approx 5” (125mm) diameter and approx 2 1/2” (62.5mm) thick. Using a blank of this diameter your lathe will need to have a swing over the bed bars of more than 5 1/2”...
- Page 6 Page 6 Instruction/Data Sheet Place the toolrest at the “safe toolrest position” Turn the outside diameter of the bowl blank so that it is perfectly round. Now place the toolrest in the “safe toolrest position” at the face of the blank and true up. Mark the centre with a pencil.
- Page 7 Page 7 Instruction/Data Sheet Now draw 3 circles from each centre ensuring that there is a 1/2” (13mm) gap between the circle and the arc. These circles will indicate the position of the 3 parts of the cloverleaf. Now mark the size and position of the centre circle of the bowl. Loosen the screws and remove the eccentric boss.
- Page 8 Page 8 Instruction/Data Sheet Now the line marked ‘2’ will be in line with the reference mark on the chuck body. Now move the toorest to the “safe toolrest position” at the face of the wood. Turn the second small dish outlined by the small circle with the centre marked ‘2’. * Remembering to only go as deep as the previous dish * Switch off the lathe.
- Page 9 Page 9 Instruction/Data Sheet Once the outside is turned down to the mark, switch off the lathe. Check, sand and finish as with the previous sides. Loosen the boss screws and turn the boss so that ‘0’ is visible in the sight window and re-tighten the screws.
- Page 10 Page 10 Instruction/Data Sheet Cabriole Candlestick The next project project we are going to make is a Cabriole Candlestick. We will use a piece of hardwood approx 9.5” (240mm) long and approx 3” (75mm) square. We will use the hexagonal Ball & Socket for this project.
- Page 11 Page 11 Instruction/Data Sheet Using a fine parting tool part down at the first mark leaving approximately 1/2” (13mm) stem for the neck of the cup. The cup of the candlestick can be turned approx 1 1/2” (38mm) long to the first mark. Increase the lathe speed as appropriate.
- Page 12 Page 12 Instruction/Data Sheet The lathe speed can now be increased as the wood is turning concentrically. But remember that the main parts of the candlestick are turning off centre so keep fingers well clear. Switch the lathe on. Take a clearance cut a well as a parting cut and allow for the holding screws when parting the candlestick from the waste wood.
- Page 13 Page 13 Instruction/Data Sheet Scallop lid box The last project we will make a box with a scallop detailed lid. For this project we will use the facceplate. We are going to use a bowl blank of hardwood approx 4 1/2” (152mm) diameter and approx 3 1/2” (89mm) thick.
- Page 14 Page 14 Instruction/Data Sheet Return the tool rest to the “safe tool rest position”. Slow the lathe to its slowest speed. The wood is now at full off centre so extra care has to be taken while turning as before. Now turn a small button shape, some of which will overlap the edge of the lid.
- Page 15 Page 15 Instruction/Data Sheet Place the tool rest in the “safe tool rest position”. Switch the lathe on and look for the outer edge of the second groove. Mark and turn the third groove strating at the edge of the second groove as before. Switch lathe off.
- Page 16 Page 16 Instruction/Data Sheet NOTES...
- Page 17 Instruction/Data Sheet Robert Sorby Eccentric Chuck is just one of many unique and innovative products that we manufacture in our factory in Sheffield, England. Listed below are just a few of the more specialised tools and products that are available. Please read on the back page for further information on our renown catalogue and website.
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