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Thread: Screwcutting with AL320G
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7th December 2010, 12:54 PM #1
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Screwcutting with AL320G
Wondering if anybody with an AL320 can help me with this. If I try to cut a 1.25 (or 20 TPI) thread using the chasing dial I cannot get the tool to track in the same thread ie I do the first pass and the second pass will usually be half a thread our effectively wrecking the thread. This occurs whether I use the same number on the dial or not.
If I leave the half nuts engaged and reverse the motor there is no problem.
I can cut 1mm and 1.5mm using the dial with no problem.
Got me stumped why there is an isuse with just the 1.25?
I raised this back a while but I thought the extra info might help.
Any thoughts appreciated.
Scott
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7th December 2010, 02:02 PM #2
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dose the thread Chasing Gear cover all the pitches you listed or do you need to use another gear.
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7th December 2010, 02:04 PM #3
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It only came supplied with one gear but I will check. Thanks.
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7th December 2010, 02:08 PM #4
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If it only has 1 Gear you are either missing 2 or it maybe an Imperial leadscrew.
The Metric Leadscrew machines are normally supplied with 3 Gears,you interchange for the appropriate Pitch.
Did you get the Lathe new,if so the manual should explain what you need to do.
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7th December 2010, 02:22 PM #5Dave J Guest
As Pipe Clay said they usually have different gears for different pitches for a metric lead screw, this maybe your problem.
Unless it's a imperial lead screw but I don't think they come with one.
See if you can find out from H&F's if they come with extra gears, if not just keep reversing the lathe to cut those threads.Sometimes I just reverse the lathe on short threads and it gives me time to put a few drops of oil on it for the next pass.
This posting shows the different thread chasing gears on the next size up lathe.
Chester UK Ltd :: View topic - Crusader screwcutting drop in dial
Dave
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