Woodturning Introduction: Difference between revisions

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(→‎Precautions: start slow)
(→‎Safety: danger of runback - practice in the middle!)
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=== Dangers ===
=== Dangers ===
* quickly spinning exposed chuck and workpiece
* quickly spinning exposed chuck and workpiece
* tools, especially [[Skew Chisels|skew chisels]], can get caught on the workpiece's surface
* tools, especially [[Skew Chisels|skew chisels]], can get caught on the workpiece's surface (leading to a ''catch'' or ''runback'')
* [[Parting Tools|parting tools]] can get stuck in the cut due to the high friction
* [[Parting Tools|parting tools]] can get stuck in the cut due to the high friction
* flying shavings, splinters and dust
* flying shavings, splinters and dust
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* unplug the machine before opening the belt housing to select a different speed
* unplug the machine before opening the belt housing to select a different speed
* treat the tool rest like a barrier: never reach across it with your fingers "or any other part of your anatomy you want to keep"<sup> [http://www.docgreenwoodturner.com/gouges5.html]</sup> while the lathe is running!
* treat the tool rest like a barrier: never reach across it with your fingers "or any other part of your anatomy you want to keep"<sup> [http://www.docgreenwoodturner.com/gouges5.html]</sup> while the lathe is running!
* practice far in the middle of your workpiece and stay at least a tool's width away from the lathe's metal parts (centers, chuck) until you can control the tools without runback


== Suggested Reading ==
== Suggested Reading ==

Revision as of 19:04, 3 August 2018

This page is INCOMPLETE and still missing some important information before it can be used as a resource. Please use the "Discussion" feature above or talk to one of the tutors if you would like to help improve it. Thanks!



This is the content required for an introduction to our wood lathe and woodturning tools - reading this does NOT replace the mandatory session with a tutor! It will make it a lot quicker though ;-)

Let's begin! First off, make sure you have read the machine's manual and have watched this video explaining how "catches" happen.

Safety

Dangers

  • quickly spinning exposed chuck and workpiece
  • tools, especially skew chisels, can get caught on the workpiece's surface (leading to a catch or runback)
  • parting tools can get stuck in the cut due to the high friction
  • flying shavings, splinters and dust
  • quickly spinning workpiece might fly at you if it gets loose
  • belt-based speed selection

Precautions

  • always make sure all screws and nuts (tool rest, tailstock, spindle) are properly tightened
  • give the workpiece a test spin by hand to check whether it catches on anything before turning on the motor
  • wear a face shield
  • wear a dust mask depending on your material
  • do NOT wear gloves, loose-sleeve clothing or open long hair!
  • start at the slowest motor speed, increase when the workpiece is rounder [1]
  • proceed slowly and smoothly "into" the workpiece - you want to shave material off, not break it!
  • always let the tool touch the tool rest before the workpiece
  • make sure the tool is supported on the side you're going to cut with
  • unplug the machine before opening the belt housing to select a different speed
  • treat the tool rest like a barrier: never reach across it with your fingers "or any other part of your anatomy you want to keep" [2] while the lathe is running!
  • practice far in the middle of your workpiece and stay at least a tool's width away from the lathe's metal parts (centers, chuck) until you can control the tools without runback

Suggested Reading

Besides these safety notes, you should read our page on woodturning tools.

Demonstration

The tutor will show you these steps in detail:

  • speed selection
    • unplug the lathe
    • open the belt housing on the left
    • loosen the red screws holding the motor in place (just a little bit, do NOT remove them!)
    • lift the motor up to get some slack in the belt
    • switch the belt to the desired setup (same position on both pulleys!)
    • let the motor go back into its original position and re-tighten the holding screws
    • leave the belt a bit looser than you would on the drill press - that way, it can slip when an accident happens!
  • setting up a workpiece between centers ("spindle work")
    • find the center point and mark it on both sides
    • remove the drive center from the headstock, set it on the center point you marked on your workpiece, and hammer it "in"
    • in case of hardwood, a few relief cuts across the center point may prevent splitting
      • this may also reduce the need for hammering the drive center into the workpiece
    • screw the drive center back onto the headstock spindle and move the tailstock as close as the workpiece allows
    • drive the tailstock spindle into the workpiece and secure it with the nuts on either side of the tailstock
  • letting the bevel of a gouge "ride" on the workpiece before the cut