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chandler0109
11-26-2010, 03:31 PM
Hi All

I have an Emco Maximat V7, and am looking to upgrade to a V10, I may have found one but would not be able to inspect it in person. The V10 does not have a thread chasing dial, but my V7 does.

My question is: Is the thread chasing dial interchangable between the two models? I know they use a similar leadscrew, but don't know the mounting configuration of the V10.

Any guidance would be greatly appreciated.

Thanks

Chandler

oldtiffie
11-26-2010, 06:53 PM
If the lead-screws are similar the same gear and dial will work on the new machine. It may have a different housing or mounting or bracket which may need to be made but the gear is the hardest part to make.

Most or many "inch" lathes have a gear with a number of teeth which when rolled along the lead-screw will cause the saddle to move 4".

So a 1/8" (0.125") pitch lead-screw (8 tpi) will have 4"/0.125" = 32 tooth gear.

A 1/6" (0.1667") pitch lead-screw (6 tpi) will have 4"/0.1667" = 24 tooth gear.

So a 1/4" (0.250") pitch lead-screw (4 tpi) will have 4"/0.250" = 16 tooth gear.



Etc.

Bill Pace
11-26-2010, 08:13 PM
FWIW, I have a Compact 10, which I think is a good bit of difference from the V10 (actually from any of the other Emco's!). Anyway, it does have a thread dial, and a rather odd one too - at least to me. It has the 3 different positions/gears reading at 14, 14, and 16. The lead screw measures in at 20mm with 8tpi.

Maybe the pic and lead screw size will be of some help...

http://i22.photobucket.com/albums/b301/pace1980/IMG_1908.jpg

Don Young
11-26-2010, 09:27 PM
FWIW, I have a Compact 10, which I think is a good bit of difference from the V10 (actually from any of the other Emco's!). Anyway, it does have a thread dial, and a rather odd one too - at least to me. It has the 3 different positions/gears reading at 14, 14, and 16. The lead screw measures in at 20mm with 8tpi.

Maybe the pic and lead screw size will be of some help...

http://i22.photobucket.com/albums/b301/pace1980/IMG_1908.jpg

That multi-geared thread dial with the 90 and 120 degree markings is the type used for cutting metric threads although I do not know specifically just how yours is used.

oldtiffie
11-26-2010, 09:56 PM
http://i22.photobucket.com/albums/b301/pace1980/IMG_1908.jpg

Don.

You seem to be correct as after reading your post I think it is maybe (for?) a metric lathe with a 6mm pitch lead-screw.

The "16" tooth gear is for any pitch that will divide into (16 x 6 =) 96
The "15" tooth gear is for any pitch that will divide into (15 x 6 =) 90
The "14" tooth gear is for any pitch that will divide into (14 x 6 =) 84mm

That should suit the pitches of all or most common-use metric threads.

The "127" gear will be required to cut "inch" threads. The half-nuts will need to be continually engaged an the saddle travel will have to be reversed by reversing the head-stock spindle motor.

Bill Pace
11-26-2010, 10:54 PM
I think it is maybe (for?) a metric lathe with a 6mm pitch lead-screw.
Emco offered the Compact 10 in either mm or inch and since I got none of the sheet metal housing with it that would have had - possibly - told what my particular lathe was, but I think it is the inch version. I have found a pdf copy of the operating manual, which doesnt give a way to tell which it is, but has setting for both versions. Heres a rather dim copy of use of the thread dial, which gives both mm and inch settings.

Tiffie, a quick count of the screw shows its 8tpi....

http://i22.photobucket.com/albums/b301/pace1980/Image0002.jpg

oldtiffie
11-26-2010, 11:04 PM
Thanks Bill.

It seems you have a hybrid lathe - "inch" (8tpi) lead-screw with a metric threading gear and dial.

I think you will find that the "inch" threading dial has a single 32-teeth gear, but if you leave the threading dial you have set on the "16" gear you will do OK with most common inch tpi threads.

lakeside53
11-27-2010, 01:24 AM
The Compact 10 threading dial handles both Metric and Inch - in the USA it came stock with the 3 gear indicator and an 8tpi leadscrew.

Having owned both, I'm 90% sure the V7 and V10 use the same thead dial on the 8tpi imperial leadscrew. It has a single gear. Even if it didn't quite match up, all you have to do is fashion a bracket to hold it lightly against the leadscrew - anywhere.

Circlip
11-27-2010, 04:09 AM
If you check the Emco part numbers for the indicator used on lathes manufactured in the same year it should give a clue. Ask on the Yahoo group.

Regards Ian.