Drawing ML115/900

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Artysmarty
Posts: 28
Joined: Sun 15 Sep , 2019 14:47 pm
Hardware/Software: Denfird viceroy lathe
Location: Bolton lancs

Drawing ML115/900

Post by Artysmarty » Fri 18 Oct , 2019 0:25 am

Hi All
Drawing No ML115/900m shows on section KK a part numbered ml115 985 which in the parts list is described as "foolproof pin housing" it also shows a part ML115 987 described as "foolprof pin"
This pin goes into the gear box and butts up to ml 115 952a described as "selector Shaft"
My Question is, even though this drawing is for the metric gearbox and my lathe has a metric lead screw is it possible that I dont have a metric gearbox. My reason for asking this is the absence of any such "foolproof pin housing" in or on my gearbox.
Is there another drawing for an english gearbox/

Thanks Art

rpwilson
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Joined: Tue 03 Jun , 2014 15:20 pm
Hardware/Software: None. I own a pre CNC Denford 280 Synchro lathe.

Re: Drawing ML115/900

Post by rpwilson » Fri 18 Oct , 2019 2:54 am

The first thing is no, you can't possibly have an imperial gearbox. The selector knob, the one you are having problems with, has 5 settings on a metric gearbox, and eight on an imperial gearbox. The selector lever and its quadrant on the left hand end of the gearbox similarly has 5 settings for a metric box and 8 for an imperial one, plus in both cases, neutral.
The drawing you have BVS 115 900M covers the metric box, its BVS 115 900E (E for English) for the imperial box.
I've got a copy of BVS 115 900M because its the same as my Synchro and I'm looking at Section K and can see no sign of the foolproof pin and foolproof pin housing which you mention. What is the date on yours, mine is 10/7/78.

Richard

rpwilson
CNC Expert
CNC Expert
Posts: 155
Joined: Tue 03 Jun , 2014 15:20 pm
Hardware/Software: None. I own a pre CNC Denford 280 Synchro lathe.

Re: Drawing ML115/900

Post by rpwilson » Fri 18 Oct , 2019 3:09 am

I've just looked at the detail for the Foolproof pin and its housing, (ML 984, 985 and 987 and it appears to be the spring loaded stop preventing the lever on the left hand end of the gearbox from moving upwards too far. Its bolted to the left hand end of the gearbox housing, on the outside, and appears to have no connection whatsoever with anything inside the gearbox. Its shown in Section E-E on my copy of BVS ML 900M.

Richard

Artysmarty
Posts: 28
Joined: Sun 15 Sep , 2019 14:47 pm
Hardware/Software: Denfird viceroy lathe
Location: Bolton lancs

Re: Drawing ML115/900

Post by Artysmarty » Fri 18 Oct , 2019 17:19 pm

Hi thanks for the info. Mine is definitely a metric box.

Another thought has just struck me, on the feed and speed instructions from the Denford manual. They go through it step by step and they emphasise that the lathe must be running before you engage left right or middle also for lead screw or feed shafts. Am I right in saying that these are synchro gears and as such the other shafts which they engage with should be turning. If so then I have another conundrum mine ar'nt turning even though at this stage my gear selector lever is in gear.

Any thoughts on this

Regards Art

Artysmarty
Posts: 28
Joined: Sun 15 Sep , 2019 14:47 pm
Hardware/Software: Denfird viceroy lathe
Location: Bolton lancs

Re: Drawing ML115/900

Post by Artysmarty » Tue 10 Dec , 2019 0:09 am

Hi all
Finally took the plunge and removed my gearbox front cover.
The route cause of my problem was immediately visible and was the right hand tumbler carrier part no ML115/910A was shattered in 3 different parts and the tumbler shaft was lying on the bottom of the gearbox.
I have finally managed to get a new tumbler carrier made and have refitted it into the gearbox which necessitated the removal of the gear selector handle and gear wheel.
Now the tricky bit is realigning the selector handle gear wheel with the left hand tumbler carrier part no. ML115/910b so that when I select any gear (5 thro1) then the tumbler gear ML115/911 engages deep enough with its respective gear on the gear train.
Now I have a conundrum the metric gearbox (mine) has five positions but the gear train has 6 ^gear wheels from 16T up to 32T as per attached file of drawing ML115/900B. Does any body on the forum know which gear is position 1. Logic tells me it is the 16T gear but then I am stymied as to what function the 32T gear does as it is not selectable. Also by the same context if you use the 20T wheel as position 1 then the 32T wheel is selectable but the 16T isnt.
^ "Just the same in an English gearbox which has eight selections but the gear train has 9 Wheels"
Hope I have explained this clearly. Any help appreciated
Art
Attachments
ML115_900B.pdf
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