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Member postings for Martyn Grogan

Here is a list of all the postings Martyn Grogan has made in our forums. Click on a thread name to jump to the thread.

Thread: A couple of screwcutting MATH questions!!!!
20/04/2018 07:56:39
Can anyone tell me how to convert the error in Martin cleeve's book from 1 in... To mm

I think I just divide 1 by the error. But just checking.
E.g.
1÷465=0.00215??

Also is there a way of measuring leadscrew error and don't laugh if this is wrong but I was thinking if we could. Could this be offset by the change gear error.
I'm gathering a worn LS would give -error???? If so we could avoid more - error???
Hope I'm not making a fool of myself with this but thought I'd ask?
Thanks for your time
Thread: Mystery tool
14/04/2018 14:55:47
I don't know but they look similar to what I have in mind to make to drill the holes In the drillpress to convert ml7 gears to fit the ml4 lathe
Thread: Back gears and tailstock quill lock myford ml4
14/04/2018 14:36:54
Right ok I was under the impression that if you had a gear train and the first and last were say 25t each, then it didn't matter how many gears were in between or there size. It would still give a 1:1 ratio?
14/04/2018 14:03:50
Brian, Jon Thanks again I think that will sort it.

Brian tel just let me know and I'm more than happy to pay.

Jon I'm confused with the 18t wheel, as it's in the middle of the gear train surely it doesn't change the ratios?
14/04/2018 07:18:19
Thanks Jon but i meant the gears in frount of the pulleys. The ones that make any gear setip go really slow. The lever is really stiff when in disengaged mode but ultra loose when engaged and the gears just get thrown appart.

The quill clamp rotates and handle tightens but does nothing to the quill.
13/04/2018 21:12:39
Can anyone tell me how the quill clamp works as mines not clamping?

Also the back gears won't stay engaged?

Any help would be greatly appreciated
Thread: Can anyone identify this lathe please?
13/04/2018 04:24:48
Computer down and can't add photos on phone. But it's the red one in my album?????
Thread: Ml4 change gears
10/04/2018 23:33:33
Brian...no rush. I don't mind the wait.
I've received cleeve's book today so I'll be reading that for the next month lol

Jon... pm sent thanks

Roderick... thanks I'll try them out when I get the gears at let you know.

Howard... thanks for that, I've taken note!!!


Going to give it a good clean and set up this week as I'm not at work this week as my cars engine court fire today not a pleasant experience but on the bright side I get to spend some time in the workshop !!!!
09/04/2018 18:06:29
Hi does anyone know where I can get a 47t gear as I can't find one listed anywhere?
09/04/2018 17:57:03
Brian Thank you so much for the offer id really appreciate it thanks.
Being new and the cost of the gear as they are I don't want to buy one's I end up not using. Although I understand and appreciate some error is acceptable I haven't a clue how much.
Again thanks
09/04/2018 14:02:58
As I need to buy a load of gears I was wondering if I should go the 127 route. Any views would be welcome. And is there a chart to work out what other gears I need to go with it.
08/04/2018 19:41:28
Thank you too everyone for your replies.
Got things a little more straight in my mind now and know which gears I need to do m6 m8 m10.
Taken gear off and yes I'm wrong it is 25!!!
07/04/2018 22:36:40

Thanks for replies. Book has been ordered!!!

what i was trying to ask was if the tables i found were correct. as they have different information in them. or are they just different ways of reaching the same outcome?

screenshot_20180406-210019.jpgscreenshot_20180406-204100.jpg642622.jpg

06/04/2018 21:23:36
Can anyone tell me how to post picks please?
06/04/2018 21:14:15
Hi all newbie here both to this forum and to lathes. Ive been researching cutting metric threads and have got confussed!!! The first fixed wheel on my ml4 is a 25 but your ml4 thread states theres is a 20? Also i have found charts saying different combos of gears. I'll try and add some picks if I can work out how.can you please help me to know what sizes I need? Thanks
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