Guide for Use of the McNaughton Bowl Saver System
General
This system was originally designed as a bowl center saver.  This means that several bowls can be turned  from one piece of wood.  This not only extends the usefulness of valuable wood, but it also allows a much more rapid removal of bowl interiors.  However it is also very valuable as a device for many other avenues of creative turning.  For Instance:
  1. Make mirror or picture frames and rings for inlays, etc.
  2. Make nests of dishes from a single blank, the backside of one dish producing the inside of the next.
  3. The curved radius blades can produce multi-walled or captive vessels.

Additionally, these walls can be carved or textured for many interesting effects.

The heart of the system is the Tool Post, which gives complete freedom for the turner to choose the angle of presentation.  The same post will also accept three different sizes of blades, miniature, standard and large.  The System can be used with either left or right handed blades, which means that turning can be either inboard or outboard.

Advantages
  • Quick and easy to assemble
  • Super Long-life blades
  • Saves centers up to 450mm (18") in diameter
  • Work can be secured with tailstock for added security
  • Can be used for regular parting
  • Maximum utilization of exotic/unusual wood
Assembling the Tool Post
  1. Insert the small section of the column through the  bottom of the hole in the support arm.  The long base of the support arm now rests on the shoulder of the column.
  2. This top part of the column can now be inserted into the hole in the bottom of the gate.
  3. The bottom of the gate now rests on the support arm.  The small brass stop pin must clear the arm with the elevated part of the gate always facing forward.  now, use the wrench to turn the gate grub screw in  so that its head enters the groove in the column.  Be sure to leave sufficient clearance for the column to be secured, but will turn freely.
  4. Be certain to keep the inside of the bored hole in the gate covered with oil.  Take precautions to keep it grit free.
Guide for Bowl Center Saving
  1. Securely fasten blank to face plate or chuck
  2. Shape the exterior to final form and after mounting on faceplate or in chuck, level face of blank.  If practical, further secure the blank by the tailstock.  Make sure your chuck or faceplate is of adequate strength.

          Before commencing the cutting action:

  1. Identify and make the true center of your blank (turn on lathe and mark center).
  2. Insert system tool post in lathe tool rest assembly, replacing the normal tool rest.
  3. With the tool rest backed off from the blank, place the Kelton System parting tool in its handle and insert in the tool post by passing it under the cross brace and between the support gate pins.  Raise the handle so that the top of the blade presses up on the cross brace.  Move the parting tool forward in the post assembly until the handle comes against the Cross Brace.  Holding it in this position, move the entire tool rest assembly so that the cutting tip is positioned at the center of the blank where you previously marked it.  Adjust the height of the tip so that it is EXACTLY ON OR JUST BELOW CENTER.  (If you have the tip above the center, the tool will tend to buck and jerk when you commence cutting.
  4. Pull parting tool back towards you until the tip is at or just beyond the edge of the tool rest and re-position the tool rest assembly close to, but with adequate clearance from the bowl blank face.  With experience you will quickly learn where to position the tool rest with each of the different blades so as to get the best results from different shaped blanks.
  5. With the lathe set at a safe speed, carefully advance blade into the work for the required distance to attain blank removal.  KEEP THE BLADE RAISED AGAINST THE SUPPORT ARM.  If the blade locks in the gate, it can be released by turning the gate a small amount by hand.  To facilitate easy blade insertion into the work, it is recommended that small back and forth sideways movements of the handle (fishtailing), will serve to widen the cut.  Also re-cut with the widest part of the tip by withdrawing the blade and inserting it again.  Stop the lathe before completion of the cut and pop the saved center from the blank.
  6. NOTE:  The tool tends to cut differently on end grain compared to how it cuts on side grain.  Typically at the start of cuts on side grain pressure is needed to push it into the cut, whereas on end grain at the completion of a cut less pressure may be needed and the handle may have to be pulled back on to prevent the cut proceeding too quickly.
  7. Shavings built up along the blade during deep cuts can be removed by withdrawing the blade slightly and reinserting it.
  8. Application of friction reducing substances between the gate, pins and along the blade can help increase the ease of blade travel.  Teflon works well.
  9. Use these blades only with the positive support of the McNaughton System tool post.
  10. Use the McNaughton System only on adequately strong lathes.   Weak tool rest holders should be replaced with ones of sufficient strength.   The System works best on lathes that are free of vibration.  A lack of rigidity will reduce efficiency and effectiveness.
  11. As a safety measure, it is recommended that lathe drive belts be loosened slightly to allow a small amount of pulley slippage in the event of a "catch".
  12. For safety and ease of use, it is recommended to hold the handle at its end with the right hand.  This allows for ease in raising the handle so that the blade is brought , and kept in contact with the cross brace.  It also has the added safety feature of keeping the turner further from the work piece.
  13. Remove shavings before they build up.  Take particular care concerning shavings overload toward the end of the cut.  Here there can be a great deal of friction due to the reduced rate of travel and cut (surface feet per minute) as well as the length of overhang of the blade.  Inattention to these conditions can result in a bent blade.
Tool Sharpening
When sharpening, try to retain the original proportions and angles of the blade.  Clearances are important.  The extreme wear resistant cutting surface will not loose hardness.  The tool guts by way of the raised burr at the cutting edge.  A few upward wipes with a good stone, e.g., an Arkansas or diamond, will maintain this fine burr.  Avoid grinding until genuinely required.  Sharpen only the front surface of the blades.
Precautions:
When using the Kel McNaughton System, observe all the normal woodturning safety procedures.  This accessory is intended for use only by competent wood turners.  Out-of-balance blanks can generate substantially greater forces that normal turning, make sure that your blank is reasonably balanced.   This tool is intended for use only on substantial, well-built lathes.   Although this accessory can be used without the tailstock, when practical, use it for additional support.