screwcutting

[here againParticipant @hereagain]

Back to beginners for me! Want to cut my first screwthrwad and eventually found ready to use charts for change gears on arc euro s site..BUT still not sure as there is one line calling itself wheel set up A or B..
Whats that please? Jonathon

[here againParticipant @hereagain]

changewheels

[John Stevenson 1Participant @johnstevenson1]

You need to set the knurdle pinion to line up with the rimshaft.

Failing that go back and re-read your post and see if you could answer it given the complete lack of information like model and some details.

[Les Jones 1Participant @lesjones1]

You need to list the pitch or TPI of your leadscrew, all the changewheels you have, the number of teeth on the spindle gear and the ratios if there is a gearbox between the last changewheel and the leadscrew. Without this information it is not possible to do any calculations.

Les

[BazyleParticipant @bazyle]

To actually answer your question a bit more informatively the A and B probably refer to diagrams which you might not have noticed that show some additional gears.

for example this screwcuttign chart is for a Boxford and shows several diagrams to show the different set-ups.

Found this bit of the ARC site with diagrams but no reference to which is A & B. Nice idea Ketan but can you do some for other lathes please.

Here we are at last an article which I don't have time to read at the moment but don't see the diagrams – guess who wrote the article    

Edited By Bazyle on 27/08/2016 15:07:56

[Brian WoodParticipant @brianwood45127]

O K, you have all poked a bit of fun at 'Here again' but to help him, Bazyle turned up Neil Wyatt's article in his third reference.

​The wheels are identified as Mandrel A, meshed with the intermediate gear B; that is in turn coupled to wheel C which then drives wheel D on the lead screw.

Look at the photo in the article which shows the set up for a 1 mm pitch thread on a 16 tpi lead screw mini lathe, and how they are arranged to do that. Read the article too, it will tell you much

Brian

[SandgrounderParticipant @sandgrounder]

And when you've set the gears up, engage the carriage/ leadscrew drive, turn the chuck round by hand say 10 times ( more for a fine thread ) and measure how far the carriage has travelled and you'll be able to check it will cut the right pitch thread.

John

[Raymond AndersonParticipant @raymondanderson34407]

Don't be surprised at the op's reaction. I would have been inclined to react the same way. Ok. he never provided the vital info, but certain folk could simply said "give us more info " no need for sarcasm. Its little wonder why a lot of good posters have left this site.

[Neil WyattModerator @neilwyatt]

Posted by Bazyle on 27/08/2016 14:53:27:.

Found this bit of the ARC site with diagrams but no reference to which is A & B. Nice idea Ketan but can you do some for other lathes please.

The charts (which are stuck on the gearbox of new lathes) include diagrams clearly showing how the gears should be fitted to the banjo. The clue is that the diagram showing three gears applies to setups with three gears and the diagram with four gears appllies to setups using four gears.

I suspect Ketan only supplies the data for lathes he sells! – and that article looks very familiar

Neil

[John Stevenson 1Participant @johnstevenson1]

Posted by Raymond Anderson on 27/08/2016 16:44:05:

Don't be surprised at the op's reaction. I would have been inclined to react the same way. Ok. he never provided the vital info, but certain folk could simply said "give us more info " no need for sarcasm. Its little wonder why a lot of good posters have left this site.

No true he never provided enough or even any usable information.

Now I'll help anyone out but why should I or anyone else bother to help anyone who's just too plain idle to even ask for help correctly. and as regards reaction the deleted post said it all.

It wasn't sarcasm but humour, OK perhaps not your type but coming back, saying sorry yes what I meant to say was etc would have got him far more results.

[Raymond AndersonParticipant @raymondanderson34407]

Hi John, It wasn't your post that I was referring to it was one of the others that was nothing more than impudence. And other than the impudent reply from another poster I dare say the OP would probably have come back with more info. Being a bricklayer i'm certainly thick skinned , but even I would have taken one of the posts as cheek, nothing less.

Cheers.

[Brian WoodParticipant @brianwood45127]

Posted by John Stevenson on 27/08/2016 17:06:13:

Posted by Raymond Anderson on 27/08/2016 16:44:05:

Don't be surprised at the op's reaction. I would have been inclined to react the same way. Ok. he never provided the vital info, but certain folk could simply said "give us more info " no need for sarcasm. Its little wonder why a lot of good posters have left this site.

No true he never provided enough or even any usable information.

Now I'll help anyone out but why should I or anyone else bother to help anyone who's just too plain idle to even ask for help correctly. and as regards reaction the deleted post said it all.

It wasn't sarcasm but humour, OK perhaps not your type but coming back, saying sorry yes what I meant to say was etc would have got him far more results.

John,

it would make sense to delete my post that followed too, it looks very odd as it is

Brian

[John Stevenson 1Participant @johnstevenson1]

Posted by Raymond Anderson on 27/08/2016 17:26:26:

Hi John, It wasn't your post that I was referring to it was one of the others that was nothing more than impudence. And other than the impudent reply from another poster I dare say the OP would probably have come back with more info. Being a bricklayer i'm certainly thick skinned , but even I would have taken one of the posts as cheek, nothing less.

Cheers.

OK Raymond and to try to keep this post on track I'll send you a PM.

[BWParticipant @bw]

http://www.woodworkforums.com/f65/lathe-thread-cutting-change-gear-calculator-118398

This is a terrific little program for change gears.

Suggest you read any introductory text or website to grasp the basic concepts (ie Sparey) , do some of your own calcs to test your understanding then use the above program.

It will calculate all possible combinations within a user specified error band.

It will accept imperial or metric leads crew and calculate closest threads in either system.

You key in your leadscrew specs and list of changears.

Bill

[BWParticipant @bw]

It also allows key in of your gearbox ratios if you have one.

[Les Jones 1Participant @lesjones1]

Hi Bill,
That sounds like a useful program but I could not get to the program via your link. I use a similar program called nthreadp.exe which is available hear. It does not have the take into account a gerbox so I have just made a a list of the effective pitches available. (Actual leadscrew pitch multiplied by the gearbox ratios.) I Have bought a selection of gears at various ME exhibitions (And bushed them or bored them to fit.) to supplement those supplied with my lathe. With these I can get very close to any thread I want to cut. These programs save a lot of time when the ratios required are not simple obvious ones. But as none of us have a crystal ball we cannot answer the OP's question with no information.

Les.

[BWParticipant @bw]

Looks like the chap who wrote it has killed his old website and is now distributing it as an app rather than a PC program.

Try here for the app download https://apkpure.com/pocket-lathe-gears/com.embarcadero.PocketLatheGears

I can vouch for the PC program but have never tried the app. Will have a play with google and see if I can find a PC download site

Bill

[BWParticipant @bw]

Cannot find a PC version – all sites I find refer back to a website that no longer exists

Edited By Bill Wood 2 on 29/08/2016 12:54:28

[HopperParticipant @hopper]

My favorite online change gear calculator is this one here

**LINK**

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Bill Wood 2 on 29/08/2016 12:38:15:

Try here for the app download https://apkpure.com/pocket-lathe-gears/com.embarcadero.PocketLatheGears

I can vouch for the PC program but have never tried the app.

.

I have just put the App on my phone, but I don't hold-out too much hope

100 downloads, 7 reviews, average rating 2.3

… Will have a play tonight.

MichaelG.

[BWParticipant @bw]

OK,

I contacted the Lathegears author.

Download for PC available here

9dt553xj8vnwzyf/LGV1.2.exe?dl=0 >**LINK**

Why I think its so good …………

You can set a maximum error ie 0.3% and it will only calculate combinations inside that tolerance

You can include all gearbox ratios as well as all change gears

You can specify certain gears must stay in certain positions.

If no combination exists it will calculate the number of teeth required on the missing gear

Will calculate both metric and imperial threads for both metric and imperial lathes

Will output all results to a file on PC and you can then copy and paste or print or do further calcs in excel.

Bill

[Les Jones 1Participant @lesjones1]

Hi Bill,
Thanks for finding the link to the Lathegears (LGV1.2.exe) I have had a quick play with it and it looks very good. The only slight problem I found was that when installed in the default location (Program Files (x86)) it would not let me save the .ini file containing the data I had entered under "generic lathe" for my lathe. I copied all the files it had installed to a directory (Folder) that was about 3 levels down from the root of the C: drive and it then allowed me to save the changes. I am using Windows 7 so it is probably a protection thing about the Program Files (x86) directory.

The OP seems to have lost interest in the subject but it has made me and others aware of the program "Lathegears"

Thanks again.
Les.

[BWParticipant @bw]

Hey Les,

That issue has been bugging me too, Windows Vista, I think its similar to Windows 7.

Do you have to copy an entire directory or just a few files ?

If you do this sort of thing with any program do you have to somehow tell the computer to look in the new directory or does it simply just find the files wherever they are ?

I dont know much about computers

Bill

[Les Jones 1Participant @lesjones1]

Hi Bill,
The original install just installed these files straight into the Program Files(x86) directory. (Without creating a subdirectory which is normally done.)

Hercus Model A – Imperial Thread.lat
Hercus Model A – Metric Thread.lat
Hercus Model A.lat
LatheGears.exe
Nuttal.lat
Toreb (Swedish).lat

I just copied them into a directory I created under a directory where I keep stuff relating to my lathe. (A Chester DB-10G)

I then just double clicked on "LatheGears.exe" (The one in the directory I created as the link from the desktop would have gone to the one in Program Files(x86) This then worked OK and let me save the setting I had entered.
I would suggest that before you install the program you create a directory to install it to. I would avoid any of the directories that Windows wants you to put things in. (Such as My documents.) Then tell the install program to install it into the directory you have just created.
This is the full path to where I put it.

C:My_FilesDB-10G_LatheScrewcutting_calcLGV1

I put most things below My_Files (A directory I created directly on the C: drive.) For Backing up I just copy the "My_Files" directory to another disk drive.

I hope this works for you using Vista.

Les.

Edited By Les Jones 1 on 11/09/2016 14:39:29

[Les Jones 1Participant @lesjones1]

Hi Bill,
I tried doing a clean install of LatheGears into the directory
C:My_FilesDB-10G_LatheScrewcutting_calcLGV1
I found thet it does not take any notice of the directory where yo tell it to install to. It just installs it in
Program Files(x86)
The only way I can get round the problem is by moving (Or copying.) the files to another directory.

Les.

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