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Thread: HAMATU TH-6 Lathe
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11th Feb 2019, 08:28 AM #16Intermediate Member
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11th Feb 2019, 04:57 PM #17Member
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Sorry Ryan
I have had a good search with no success.....
I think my original manual may have accidentaly got binned
Tom
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13th Feb 2019, 09:00 AM #18Intermediate Member
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6th Jun 2019, 11:51 AM #19Intermediate Member
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Hey Guys, does anybody know how change gears are spec'ed on HAMATU lathe?
Is it mod 1 or something? I'm missing some gears for imperial thread cutting.
I also have weird issue with metric thread cutting. When I setup the lathe for 1.25 pitch it actually outputs 19g which is close but not close enough to put a nut on.
Where should I look to pin point this behavior?
Hope somebody can help.
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6th Jun 2019, 05:05 PM #20Novice
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- Jan 2019
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- crossley VIC
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hammatu lathe
Hi KYP,
you don't say whether your lead screw is metric or imperial. Mine is imperial ,4TPI and the gear train to cut imperial threads are:upper gear48,driving 127 which drives 71 which drives 38 on the lowest gear. Probably the gearbox input shaft.I haven't mastered the art of posting photos from my phone to this blog yet .When I do Iwill post photos of my lathe
Cheers Walter Mitty
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7th Jun 2019, 04:57 PM #21Novice
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gear train
Hi KYP,my gear train which in conjunction with a 4 TPI leadscrew is:48Tdriving127T which drives38T which is mounted on the lowest shaft .Seems to be the feed gearbox shaft.
Cheers Walter Mitty
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7th Jun 2019, 05:00 PM #22Novice
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corrections to previous reply
Apologies KYP train is 48 driving 127 driving 71 driving38
Cheers Walter
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12th Jun 2019, 10:16 AM #23Intermediate Member
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so, it is 4tpi lead screw. and according to the chart it is 48->127-105->84 gear box setup for metric threads. The lever position on the chart shows No.4 for 1.25mm pitch but in that position the thread is off. I have found it works to a spec if I move lever to # on the chart - 1 so 3. Same for 1.5mm pitch it is 5 instead of 6. It doesn't look like the access to the lead screw gearbox is easy. I wonder what can be wrong. I really like the lathe and want it to work by the book.
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12th Jun 2019, 10:54 AM #24Most Valued Member
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Maybe pop up a photo of your geartrain and the manual page?
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12th Jun 2019, 01:56 PM #25Novice
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hamatu lathe
Hi KYP,looking at the chart on the lathe,to cut a metric 1.25 thread,set the machine on: 1 which is the gear train you mentioned: 4.
You never mentioned Lever 1 or Lever C.
Cheers Walter Mitty
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12th Jun 2019, 02:12 PM #26Intermediate Member
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12th Jun 2019, 02:50 PM #27Novice
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