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equipment:metalshop:metallathe:howto:cutthreadsl2r [2024/08/15 11:44] – created ralawrenceequipment:metalshop:metallathe:howto:cutthreadsl2r [2024/11/19 21:42] (current) – external edit 127.0.0.1
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 ===== How to cut Threads using the Left to Right Method. ===== ===== How to cut Threads using the Left to Right Method. =====
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 +**__//THIS IS WORK IN PROGRESS//__**
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 Please note this guide is specific to Bristol Hackspace’s Harrison M250 Metal Lathe. Please note this guide is specific to Bristol Hackspace’s Harrison M250 Metal Lathe.
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 1. Remove the cover plate with an M3 hex key. 1. Remove the cover plate with an M3 hex key.
  
-2. Use an M24 spanner on the end of the Lead Screw to rotate it until the edges of the cover become visible. Only pull the spanner towards you do not try to go in the other direction you will unscrew the nut of the end of the Lead Screw.+2. Rotate the Lead Screw until the edges of the cover become visible. 
  
-3. Push the edge of the cover upwards to reveal the Shear Pin. You may need to use the spanner to rotate the lead screw further.+3. Push the edge of the cover upwards to reveal the Shear Pin. You may need to rotate the lead screw further.
  
 4. Now by rotating the Chuck by hand locate the slot for the Shear Pin to slide in to. Make sure you have the Traverse Direction knob set to forward. 4. Now by rotating the Chuck by hand locate the slot for the Shear Pin to slide in to. Make sure you have the Traverse Direction knob set to forward.
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 2. Set the Gearbox Knobs to the correct setting for your desired thread. 2. Set the Gearbox Knobs to the correct setting for your desired thread.
  
-__**Step 3. Fit the correct Threading Gauge.**__+__**Step 3. Fit the correct Threading Indicator Dial.**__
  
-1. If you have set the Gearbox Knobs to an “M” setting you will need to use the Blue Threading Gauge otherwise use the Green Threading Gauge.+1. If you have set the Gearbox Knobs to an “M” setting you will need to use the Blue Threading Indicator otherwise use the Green Threading Indicator.
  
-2. To fit the gauge, ensure the metal bolt is screwed back in to the body. Then place the locating lug in the locating hole on the right hand side of the Carriage and rotate the gauge so as to bring the teeth of the cog to mesh with the Lead Screw. Now screw the bolt in to the threaded hole and tighten firmly with 6mm Allen key. Please remove the TID when you have finished using it. For more details on fitting the gauge see……+2. To fit the Indicator, ensure the metal bolt is screwed back in to the body. Then place the locating lug in the locating hole on the right hand side of the Carriage and rotate the Indicator so as to bring the teeth of the cog to mesh with the Lead Screw. Now screw the bolt in to the threaded hole and tighten firmly with 6mm Allen key. Please remove the Indicator when you have finished using it. For more details on fitting the Indicator see……
  
-3. With the Lathe in a safe configuration turn on the Lathe and check the Gauge is going round.+3. With the Lathe in a safe configuration turn on the Lathe and check the Indicator is going round.
  
 __**Step 4. Select the correct direction of cutting.**__ __**Step 4. Select the correct direction of cutting.**__
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 Move the Carriage etc. so that the tool is well away from everything. Set the Lathe going and as the Gauge come around to one of the numbers gently lift the Threading Handle up and you should feel it engage. The Carriage should move from left to right. Move the Carriage etc. so that the tool is well away from everything. Set the Lathe going and as the Gauge come around to one of the numbers gently lift the Threading Handle up and you should feel it engage. The Carriage should move from left to right.
  
-__**Step 9. Test thread spacing.**__+__**Step 9. Set up the DRO.**__
  
-__**Step 10. Set up the DRO.**__ 
  
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 +__**Step 10. Test thread spacing.**__
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 +Blacken the surface where the thread will be using a marker pen. With the Lathe running bring the cutting tool in to the lightest contact with the stock at the left end of area to be cut. When the Threading Indicator comes around to one of the numbers gentle lift the Threading Handle and it will engage. A trace of the tread will now be visible on the stock. Check this is the correct spacing either with a ruler or a threading measurement gauge.
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 ====Stage 3. Cutting the thread.==== ====Stage 3. Cutting the thread.====
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 1. Set lathe to normal forward spin direction. 1. Set lathe to normal forward spin direction.
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 2. Disengage Lead Screw. 2. Disengage Lead Screw.
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 3. Remove cutting tool. 3. Remove cutting tool.
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 4. If you have changed the gears return them to the “G” configuration. 4. If you have changed the gears return them to the “G” configuration.
  
-Further Discussion.+5. Remove the Threading Indicator. 
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 +====Further Discussion.====
  
-This is intended to be a very simply guide just covering the basics; there are many more areas of thread cutting not covered in this guide. The Internet offers lots more information and Youtube videos.+This is intended to be a very simply guide just covering the basics; there are many more areas of thread cutting not covered in this guide. The Internet offers lots more information and YouTube videos.
  
 Non metric threads. Non metric threads.
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