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Mine Exploration Forum

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Author Climax Imperial Rock Drill rebuild
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Climax Imperial Rock Drill rebuild
Posted: 26/04/2017 20:54:22
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grahami wrote:

Found this in one of my box files - hope it's both relevant and of interest.
https://www.aditnow.co.uk/documents/Personal-Album-54/drill003.pdf

Grahami


Absolutely amazing, many thanks. FlowersFlowersFlowersFlowers
IP: 5.80.128.211
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Climax Imperial Rock Drill rebuild
Posted: 26/04/2017 21:48:32
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grahami wrote:

Found this in one of my box files - hope it's both relevant and of interest.
https://www.aditnow.co.uk/documents/Personal-Album-54/drill003.pdf

Grahami


The cover photo is a J.C. Burrow photo taken at South Crofty in 1910. Does anyone have a decent quality copy?
IP: 5.80.128.211
Morlock

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Joined: 31/07/2008

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Climax Imperial Rock Drill rebuild
Posted: 26/04/2017 22:35:42
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grahami wrote:

Found this in one of my box files - hope it's both relevant and of interest.
https://www.aditnow.co.uk/documents/Personal-Album-54/drill003.pdf

Grahami


Most interesting.Smile
IP: 86.186.101.6
Graigfawr

Joined: 04/11/2009

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Climax Imperial Rock Drill rebuild
Posted: 26/04/2017 22:42:24
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It appears on p.50 of D.B.Barton 'Historic Cornish mining scenes underground', Truro, no date, which dated this photo to February 1910 and identified the drill as 'a 3 1/4" Stephens drill'. The acknowledgements on p.4 credit all images in the book to 'the Royal Institution of Cornwall, the County Museum, Truro'. IP: 94.194.74.78
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Climax Imperial Rock Drill rebuild
Posted: 03/05/2017 07:46:36
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FlowersGraigfawr wrote:

It appears on p.50 of D.B.Barton 'Historic Cornish mining scenes underground', Truro, no date, which dated this photo to February 1910 and identified the drill as 'a 3 1/4" Stephens drill'. The acknowledgements on p.4 credit all images in the book to 'the Royal Institution of Cornwall, the County Museum, Truro'.


Flowers

IP: 5.80.76.31
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Climax Imperial Rock Drill rebuild
Posted: 05/05/2017 23:06:33
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Climax project part 7.

5.5.2007.

Tonight we fitted the piston which should have been a big step forward. Unfortunately we could not get the piston to run smoothly in the cylinder.

On disassembling the drill we found that the front leather piston ring packing was catching on the bore. The (now removed) packing ring shows similar wear to the original packing ring. We think that the problem lies with the sprung steel piston ring which is turns out to be oval rather than round causing to packing ring to sit too proud.

Our options appear to include:

(a) Cut the packing ring shorter in the hope that it pulls the ring in.
(b) Fit the packing ring wet so that it shrinks onto the piston ring pulling it in.
(c) Attempt to bring the piston ring back to circular.

Ideas would be welcomed.



(click image to open full size image in new window)



(click image to open full size image in new window)

New (upper) and old (lower) piston packing rings showing similar wear pattern, suggesting that the issue we are experiencing is a long standing one.



(click image to open full size image in new window)
IP: 81.153.34.133
Morlock

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Climax Imperial Rock Drill rebuild
Posted: 06/05/2017 00:06:23
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Is it safe to assume that the steel ring occupies the position indicated with the leather strip as a 'packer' below it?



If so, I would suggest that you take at least five thickness measurements of the steel ring, 2 at extreme ends, 2 at 90 degrees to those and 1 diametrically opposite the gap.
If the results show excessive wear on the rings the cylinder bore should also be checked for ovality.

Edit: Does the ring have any means of preventing rotation relative to the piston, slot/pin etc?


IP: 86.177.65.101 Edited: 06/05/2017 00:29:18 by Morlock
Tamarmole

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Location: Tamar Valley

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Climax Imperial Rock Drill rebuild
Posted: 06/05/2017 08:28:44
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Morlock wrote:

Is it safe to assume that the steel ring occupies the position indicated with the leather strip as a 'packer' below it?



No. The spring steel ring sits below the leather ring. The leather ring engages with the cylinder wall, acting as an air seal. The (inner) steel ring keeps the (outer) leather ring in tension. Because the (inner) steel ring is slightly oval rather than round it is causing the (outer) leather ring to ride too proud of the groove at one point and bind / drag on the cylinder wall.

I suspect that the reason the steel ring is deformed is that it has been pulled and pushed directly into the groove a number of times rather than being slid along the cylinder which would have maintained even stresses on the ring.
IP: 81.153.34.133
gNick

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Joined: 19/03/2012
Location: Pity Me, Durham

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Climax Imperial Rock Drill rebuild
Posted: 06/05/2017 12:31:59
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It might be worth making up a little rolling jig to try and persuade the ring back to shape. Something like this http://www.baileigh.com/manual-roll-bender-r-m3
Worth playing with scrap plate first...

--

Don't look so embarrassed, it's a family trait...
IP: 95.146.45.130
Morlock

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Climax Imperial Rock Drill rebuild
Posted: 06/05/2017 13:57:43
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Tamarmole wrote:


No. The spring steel ring sits below the leather ring. The leather ring engages with the cylinder wall, acting as an air seal. The (inner) steel ring keeps the (outer) leather ring in tension. Because the (inner) steel ring is slightly oval rather than round it is causing the (outer) leather ring to ride too proud of the groove at one point and bind / drag on the cylinder


OK. I assume the ring is shaped more like a "C" than an "O"?
The normal 'rough' fitters trick is to support the ring across a partially open vice, (1"-1.5" open) and strike the inside of the ring between the points supported by the vice jaws with a ball pein hammer. A bit of a fine art as you're trying to get past the elastic limit of the ring material a very precise amount with a hammer.Big Grin
IP: 86.186.138.21 Edited: 06/05/2017 13:59:09 by Morlock
Tamarmole

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Location: Tamar Valley

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Climax Imperial Rock Drill rebuild
Posted: 06/05/2017 17:25:17
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Thanks for the advice chaps, I'll let you know how we get on. IP: 81.153.34.133
Morlock

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Climax Imperial Rock Drill rebuild
Posted: 06/05/2017 19:10:22
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Tamarmole wrote:

Thanks for the advice chaps, I'll let you know how we get on.


If the machine is only going to be used for occasional demo purposes you could probably ditch the spring ring and fit a thicker bit of leather.
Failing that, fit a few suitable O-rings side by side to fill the groove in the piston.

All depends on your feelings on 'originality'.
IP: 86.177.65.62
Tamarmole

Joined: 20/05/2009
Location: Tamar Valley

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Climax Imperial Rock Drill rebuild
Posted: 06/05/2017 20:59:09
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Morlock wrote:

Tamarmole wrote:

Thanks for the advice chaps, I'll let you know how we get on.


If the machine is only going to be used for occasional demo purposes you could probably ditch the spring ring and fit a thicker bit of leather.
Failing that, fit a few suitable O-rings side by side to fill the groove in the piston.

All depends on your feelings on 'originality'.


O rings sounds like a good plan B.

That said I am loathe to give up on the spring steel and leather rings. I would like to keep the drill as original as we can. We are a long way from admitting defeat.
IP: 81.153.34.133
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