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  1. #1
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    Default Threading chart for al330-a lathe

    Hi, I have lost the threading chart for my AL330A lathe, 2003 model, serial no 4473, model no. CQ6230D, can anybody help please,

  2. #2
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    Nabbed this from here: https://www.graysonline.com/lot/0023...lmaster-lathe#

    Should be the same, given it's only 3 years apart in build date, but cross check it on a test piece first!
    Attached Images Attached Images

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    Quote Originally Posted by Jekyll and Hyde View Post
    Nabbed this from here: https://www.graysonline.com/lot/0023...lmaster-lathe#

    Should be the same, given it's only 3 years apart in build date, but cross check it on a test piece first!
    Yes, seen that model, but is different from mine, gear change is from 1 to 5 and A to E.
    Change gears I have are, 22, 24, 26, 44, 48 and 52. Feel like I have the only lathe like this in existence!, have been trying to find chart for a couple of months now.

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    With those lever options, sounds more like my AL335?

    What about this: https://www.machineryhouse.com.au/l183

    I have a bunch of extra gears for mine, but no idea what they're for, as the chart on the machine only ever uses variants of 24 and 48....

    *EDIT* Just went and had a look at my spare gears, they're different to yours. I have 26, 38, 44 and 52 (in addition to the 24 and 48 on the machine). Might mean nothing. But does your machine use metric or imperial feedscrews? Mines imperial, so perhaps if yours is metric that chart may need the positions of the gears swapped from metric to imperial (ie the 120/127 compound would be in use for imperial threads), or it may be completely different anyway. Just seems a co-incidence you have two 5 position levers, and a 24 and 48 gear in your set.

    *Further edit*
    Looking at the gears you have, page 30 here might be the answer, and you may be missing a 38 tooth gear? https://images.machineryhouse.com.au...n%20Manual.pdf
    If you've got metric screws, I reckon this one is a pretty good shot...

    Also, have to laugh, I've just worked out what the 'spare' gears are for on mine, goes to show how many imperial threads I cut, lol. I did know this at one stage, and promptly forgot. Also realised I'm missing a 22t gear to cut threads in the C3 column, unless it's hiding somewhere (Yep, it was, just found it)... So I'd say if you've got imperial screws, try the AL335 pattern, if metric try the second one.

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    Thanks, I will give that a try tomorrow, i have had the lathe since new, it never had a 38 gear, not to say that it was missing from new,
    Will post how it goes tomorrow., need to cut 20 tpi thread.

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    Quote Originally Posted by ivandjm View Post
    Thanks, I will give that a try tomorrow, i have had the lathe since new, it never had a 38 gear, not to say that it was missing from new,
    Will post how it goes tomorrow., need to cut 20 tpi thread.
    I don't think it would be that uncommon to be missing a gear (or a couple) from new, from reports you read around various forums. Rather annoying if you need to cut pipe threads though, given it's needed for 19tpi...

    Hopefully it works out, I reckon there's a pretty good chance looking at the gears and levers you've got.

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    Quote Originally Posted by Jekyll and Hyde View Post
    I don't think it would be that uncommon to be missing a gear (or a couple) from new, from reports you read around various forums. Rather annoying if you need to cut pipe threads though, given it's needed for 19tpi...

    Hopefully it works out, I reckon there's a pretty good chance looking at the gears and levers you've got.
    Yeah, kick myself for losing the chart, moved house , had it mounted on the wall above the lathe, and lost it in the move. Will reply tomorrow. Cheers.

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    Tried out the 20 tpi thread, but still no good, seems to be machining too fine, 26 tpi on A4 combination with 48 Z gear. Tried other combinations but all too fine tpi.
    Must be a big difference between this early lathe, 2003, and later models. Only hope is to find same lathe for sale prehaps and copy chart.

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    Quote Originally Posted by ivandjm View Post
    Tried out the 20 tpi thread, but still no good, seems to be machining too fine, 26 tpi on A4 combination with 48 Z gear. Tried other combinations but all too fine tpi.
    Must be a big difference between this early lathe, 2003, and later models. Only hope is to find same lathe for sale prehaps and copy chart.
    Do you have metric or imperial feed screws? I don't mind digging to see if I can find another chart that differs from those and uses the right gears, but would be helpful to know which feed screw type I'm looking for...

    And do you have a picture of your machine? Might help someone identify what it is, since it seems to be a bit of an odd child... I found a picture of an AL330 from 1996, but it has a Norton style box with 5 holes on one lever, and 8 on the other...

    And there's a post on this forum where someone bought an AL330a from 2002, but it's the same chart and layout as the graysonline link I first put up. Something is weird here...

  10. #10
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    Nothing in the manual but I have measured it, seems to be 8 tpi, does that sound right?, I will take some photos and post them, cheers for your help.
    There is a photo of lathe on my album.

  11. #11
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    Quote Originally Posted by ivandjm View Post
    Nothing in the manual but I have measured it, seems to be 8 tpi, does that sound right?, I will take some photos and post them, cheers for your help
    8 tpi leadscrew would be pretty normal for these machines, but it could also be 3mm pitch if it's a metric machine. 8 tpi is 3.175mm pitch. What is the cross slide handwheel marked? On my imperial AL335, one rotation is marked as exactly 0.1mm, and the metric scale shows it quite clearly as 2.54mm (rather annoying, since I work in metric). Not sure what the metric machines are marked (or what pitch the cross slide screw is) , but obviously the imperial measurement would need to be not a round number. You can check it with a dial indicator I suppose. Mostly so I can look at a threading chart, see whether the 120/127 gear factors in for metric or imperial, and thus if it's possible the chart might work for you.

    I will say though, it's getting a bit weird - there really doesn't seem to be anything much coming up other than 2 x 5 position dials like I've already posted, the arrangement from the Graysonline AL330a with the 8 and 4 position dials, or the Norton style with 5 holes and 8 holes....

    I have some thoughts, but I'll wait for photos to see, maybe I'm chasing completely the wrong type/class of machine even though its marked as a CQ6230 variant...

  12. #12
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    Quote Originally Posted by Jekyll and Hyde View Post
    8 tpi leadscrew would be pretty normal for these machines, but it could also be 3mm pitch if it's a metric machine. 8 tpi is 3.175mm pitch. What is the cross slide handwheel marked? On my imperial AL335, one rotation is marked as exactly 0.1mm, and the metric scale shows it quite clearly as 2.54mm (rather annoying, since I work in metric). Not sure what the metric machines are marked (or what pitch the cross slide screw is) , but obviously the imperial measurement would need to be not a round number. You can check it with a dial indicator I suppose. Mostly so I can look at a threading chart, see whether the 120/127 gear factors in for metric or imperial, and thus if it's possible the chart might work for you.

    I will say though, it's getting a bit weird - there really doesn't seem to be anything much coming up other than 2 x 5 position dials like I've already posted, the arrangement from the Graysonline AL330a with the 8 and 4 position dials, or the Norton style with 5 holes and 8 holes....

    I have some thoughts, but I'll wait for photos to see, maybe I'm chasing completely the wrong type/class of machine even though its marked as a CQ6230 variant...
    I will check out those points , I have posted a photo on my album, hopefully you can see, still getting used to using this forum. Back to work tomorrow so will try to post updates during the week, cheers for your help so far.

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    Quote Originally Posted by ivandjm View Post
    I will check out those points , I have posted a photo on my album, hopefully you can see, still getting used to using this forum. Back to work tomorrow so will try to post updates during the week, cheers for your help so far.
    I managed to find the album, but it seems to be empty...

    If you're on a computer, there's a button in the section below where you're typing to reply to me titled "Manage Attachments". You may need to click "Go Advanced" first.

    Click on that, then click on the button in the popup window that says "Add Files".

    That will then allow you to pick a photo from your computer to upload. You can push the little + to add more photos, then when you've picked them all, hit "Upload".

    Your photos will then show up at the bottom of that popup window, with a blue highlight and a little tick on them. You can then either click "Done" and they'll go at the bottom of your post, or "Insert inline" which will put whichever ones you have selected wherever your cursor is in the test window. Probably easier just to click "done" at this stage.

    If you then click "preview post", you should see how your post will look. If you've just clicked "done", there should be a blue box at the bottom of your post titled "attachments", if you inserted inline the photos will show up wherever in your post you put them. You can cut and paste the code to move them if they're in the wrong place, and preview again...

    If you're on the phone, no idea. I hate using my phone for internet stuff, too tiny and fiddly.

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    Ah, I can see a photo in the album now - The 3 position selector bottom right is the oddity (I, II, III). Most of these machines seem to only have two positions there. Interesting. I can see what looks like a threading dial plate on the side of the carriage, got a photo of that, and can you count the number of teeth on the gear at the bottom of the threading dial? That may help.

    The AL335 gearing and the AL346 gearing both denote that setting the change gears to 48 driving a 24 (not compounded though the 120/127), and A2 and MI selected is one to one output of the native leadscrew pitch, and MII halves that output - could be interesting to see what pitches you get in that configuration, testing MI, MII and MIII. May not tell us anything at all, of course, but still.

    I'll see if I can find a machine with a 3 position secondary selector - this could be difficult from what I've seen so far in my searches.

    I'll add your photo in here in the hope someone else has a machine with that same configuration and can just give you the right table:

    rotated.jpg

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    Thanks, I will try and download some more pictures with detail. Like i said, feels like i have the only lathe like this in the world!, it was cheap at the time and i think i know why.

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