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How deep o'clock is it?


Biker
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Being as I have been working in the loft and clearing crap out, came across a box full of old submarine gauges, best of all is this depth gauge.

So I am stripping it out for a clock project, let's see how it goes...

 

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Can I use a grinder to cut a bigger hole in the back of the cast alloy case?

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On 11/07/2021 at 13:13, Biker said:

Being as I have been working in the loft and clearing crap out, came across a box full of old submarine gauges, best of all is this depth gauge.

So I am stripping it out for a clock project, let's see how it goes...

 

20210709_114423.jpg

20210709_115823.jpg

20210709_115827.jpg

20210709_120625.jpg

20210709_125024.jpg

Can I use a grinder to cut a bigger hole in the back of the cast alloy case?

I saw one of those on Flog It,  I think it was valued at 4 1/2 thousand. 

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This is an already modified one, it was driven by an electric motor as part of a now scrapped simulator.

The real ones were driven by sea pressure, still, I had no idea they were worth that much, I'll bet the one you saw was off a WW2 submarine, this one is far newer, (Swiftsure Class)

20 hours ago, Alpha550t said:

A small slitting disc on a Dremel would do it.

Will that not take a lifetime, the alloy is at least 10mm thick..

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10 minutes ago, Biker said:

This is an already modified one, it was driven by an electric motor as part of a now scrapped simulator.

The real ones were driven by sea pressure, still, I had no idea they were worth that much, I'll bet the one you saw was off a WW2 submarine, this one is far newer, (Swiftsure Class)

Will that not take a lifetime, the alloy is at least 10mm thick..

1/2 hour.

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16 minutes ago, Biker said:

Okay cheers, I'll give it a go.  :thumbsup:

Sadly it'll be a week or so before I can get back into it.

Also got this waiting in the 'to do' box

20210714_120124.jpg

Seems a shame to change them from original, but there again what else can you do with them. Have you got a whole Sub. in bits stashed in the loft !

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  • 2 weeks later...

What diameter is the hole now & how big do you need it to be? Also what size is the case of the gauge (the bit with the 4 screw holes)?

Best way, I think, to enlarge the existing hole would be to use a hole saw - I think ones for cutting/drilling metal are available. You'd need to use a pillar drill (NOT a hand drill) to keep things as square/vertical as possible. Depending on how big the hole needs to be you'd struggle to hold a hand drill steady enough I think. Also the torque generated by a large diameter drill bit/hole saw being asked to cut through comparatively tough material would likely cause unwanted damage to both you & the thing you're working on! Not good!

Another option would be to use a milling machine & a range of end mills until the correct size hole is reached. This is getting quite specialist now though. Maybe a local machine shop could enlarge the hole for you?? Might be worth asking as I can't see it being a particularly big or complicated job with the right bit of kit.

I'm wondering if it'll fit on my lathe but I'm not sure if it's possible to machine cast aluminium.

I wish I could clear my loft out & find a box of submarine gauges! Closest I've come is finding a pair of Army boots & a small tub of screw in football boot studs :taz: 

Edited by pauluspaolo
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I need it big enough to access battery boxes and reduce weight.

 

 

3 hours ago, pauluspaolo said:

What diameter is the hole now & how big do you need it to be? Also what size is the case of the gauge (the bit with the 4 screw holes)?

Best way, I think, to enlarge the existing hole would be to use a hole saw - I think ones for cutting/drilling metal are available. You'd need to use a pillar drill (NOT a hand drill) to keep things as square/vertical as possible. Depending on how big the hole needs to be you'd struggle to hold a hand drill steady enough I think. Also the torque generated by a large diameter drill bit/hole saw being asked to cut through comparatively tough material would likely cause unwanted damage to both you & the thing you're working on! Not good!

Another option would be to use a milling machine & a range of end mills until the correct size hole is reached. This is getting quite specialist now though. Maybe a local machine shop could enlarge the hole for you?? Might be worth asking as I can't see it being a particularly big or complicated job with the right bit of kit.

I'm wondering if it'll fit on my lathe but I'm not sure if it's possible to machine cast aluminium.

I wish I could clear my loft out & find a box of submarine gauges! Closest I've come is finding a pair of Army boots & a small tub of screw in football boot studs :taz: 

The actual dial is 11" diameter,  I think I'll give alpha550t's dremel a shot. I am happy to cut it square too. Doesn't need to be round. 

 

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Something like this will sort it out, the cast alloy will be fairly soft and it shouldn't be difficult, just stick it in a drill and you'll be good to go. You get them in various grits and diameters, they only cost a couple of quid for half a dozen. We used them all the time at work for opening up tight holes in steel parts. 

Klingspor-Small-Abrasive-Flap-Wheel-KM61

 

 

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5 minutes ago, BondandBigM said:

Something like this will sort it out, the cast alloy will be fairly soft and it shouldn't be difficult, just stick it in a drill and you'll be good to go. You get them in various grits and diameters, they only cost a couple of quid for half a dozen. We used them all the time at work for opening up tight holes in steel parts. 

Klingspor-Small-Abrasive-Flap-Wheel-KM61

 

 

At least that's one thing we agree on as per my earlier post...:thumbsup:

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3 minutes ago, Roger the Dodger said:

At least that's one thing we agree on as per my earlier post...:thumbsup:

Ann Marie is in concert on Capital FM later tonight. Big M has it on all day and they've already mentioned her and played her records about a dozen times and I've only been up for a few hours. 

I'll do my best not to throw her radio out the window. 

Are you sure Big M isn't a lost relative of yours. 

:laughing2dw: :laughing2dw:

 

 

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Just now, Always"watching" said:

I'm looking forward to seeing the finished clock. With an 11 inch dial, it's going to look pretty impressive.:biggrin:

...and big .... and heavy!

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