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11
Project Logs / Re: Bodging with Boris........
« Last post by Stilldrillin on September 23, 2017, 05:40:04 PM »
Yikes! It has been almost 9 months, since I last wrote anything about this, shambles!   :Doh:


As we can now, all, see the previous Pbucket pics, using the appropriate add ons.......

Firefox.....  https://addons.mozilla.org/en-US/firefox/addon/photobucket-fixer/

Chrome..... https://chrome.google.com/webstore/search/photobucket_hotlink_fix?hl=en


I'll continue with, Blundering with Boris. Hope, there's still some interest!  :scratch:


I wondered, why the new displacer insisted on catching the inside of the hot cap.

The shaft guide was at an angle, having been hammered into the bulkhead......  :bang:




Time to strip, completely. And, totally rebuild......




I've taken the pics, as I've gone along. Not always, in sequence.....

First job, was to get rid of the unnecessary/ leaking, water jacket.

Four inch dia. Made  from tough stainless steel. Not easy to machine, with a mini lathe's power.....




What a mess, in there!




I intended incorporating the end flange, into the cooling fins.......




But. The darned thing fell off. After I'd drilled the new screw holes.....




Yet another "interesting situation", needing a solution........  :palm:

More to follow. Thanks for looking in.  :thumbup:
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Announcements & Issues / Re: Photobucket's Return........
« Last post by Stilldrillin on September 23, 2017, 05:20:32 AM »
Too late for me now as I switched all my photos elsewhere!

During the initial upset. Several people said, they had closed their account.

I decided, that was a bit, final, for me.. I left the pics there. Uselessly, taking up their storage space.  :thumbup:

Obviously, I will never upload to Pbucket, again......   
13
Project Logs / Re: Spindle problem with cincinnati tool and cutter grinder 2 spindle
« Last post by PekkaNF on September 23, 2017, 04:36:33 AM »
The bearings and belt did not arrive for this weekend, leaving me time to make some gauging and fitting utsensils.

1: made small about 25 mm long hole axially at the tight end of the arbor to ease extraction of the bearings - allows cold spray spout where needed.

2: Made M6 internal thread at the other end to lock bearing axially during the measurement.

3: Lapped the other end about 0,002 mm smaller, achieving easy sliding fit, when all parts are at same temperature. This was fun part. Could not really gauge it on cool garage, beacause part was warm.

Lap was not best possible, rather hard structural steel, but cast iron would have been much more work.

Checked the ends this morning against gauge blocks and readings are:

Gauge blocks 25,001 mm

Tight end: 24,990 mm

Sliding fit end: 24,988 mm

Finish loks awfull on the picture, it is rather difficult to see on normal light. I was affraid it would not show.



14
Project Logs / Re: New Tractor Shed
« Last post by awemawson on September 23, 2017, 02:58:11 AM »
Although the wire armour is being used as an earth in this run there is also an earth rod as an auxiliary earth as it is quite a long run.

It's four core cable, neutral and three phases, as five core was not available as far as I or my supplier could determine  at the time. However I have subsequently found a source  :bang:

The regulations do allow the use of the armour as a CPC and I used this rather good link as a guide:

https://gadsolutions.biz/regulations/swa-as-the-cpc


The relevant paragraphs of that article are:

The use of SWA as a Protective Conductor BS7671

The permitted types of protective conductor are listed in 543.2.1 and SWA is identified in sub section (v) as:

A metal covering, for example, the sheath, screen, or armouring of a cable.

It can therefore be verified that the SWA can be used as a protective conductor in compliance with BS7671.

However there are conditions on the use of SWA as a protective conductor defined in
BS7671.

1. It must be adequately sized to meet the requirements of section 543.2.1.
2. If the armour is used as a CPC then any accessories have to be connected to the associated enclosure's earth terminal by a separate CPC (flying lead) to comply with 543.2.7.
3. If the SWA is used as a main equipotential conductor other than on a PME system it must have a copper equivalent CSA, for CSAs over 25mm˛, of not less than half the cross sectional area of the associated earthing conductor and not less than
6mm˛ to comply with 544.1.1. If the installation is PME then the copper equivalent CSA of the SWA must comply with table 54.8.
4. Where a number of installations have separate earthing arrangements any protective conductors common to these have to be suitably sized to carry the maximum current likely to flow through them OR insulated from the other installation at one end to comply with 542.1.3.3
5. If the SWA is to be used as a combined CPC and main bonding conductor it must meet the requirements of both 544.1.1 and 543.1.1
6. Regulation 521.5.1 permits the use of a separate protective conductor to be run in parallel with an SWA cable.



There are tables in that link (above) giving CSA copper equivalent of various SWA cables and mine is very adequately over sized.
15
CNC / Re: multiprinter
« Last post by shipto on September 22, 2017, 05:06:40 PM »
So I aquired a cnc shield kit, some nema 17 motors and some 12mm linear bearings and made a pattern to cast the block for the Y and Z axis.
Powered up my furnace and made the casting which shrunk a little in one spot but I decided I could get away with it.
So I am currently up to the stage where I have the bearings fitted (temporarily) and it all seems to be going well.
16
CNC / multiprinter
« Last post by shipto on September 22, 2017, 04:56:10 PM »
I decided it was time I got into this 3d printing lark but I also want a laser marker for another project I have in mind so I have decided to try and make a machine that can hopefully fulfill both of those and MAYBE even be capable of mounting a high speed router spindle too.
For the project I have in mind for the laser will require long planks fit on the machine so I took to sketchup to give me an idea of what i need.
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Project Logs / Re: New Tractor Shed
« Last post by vintageandclassicrepairs on September 22, 2017, 03:49:34 PM »
Hi All,

Quote
Perhaps this is why a lot of sparkies are using an extra core as earth, and not trusting the SWA to have good continuity

The use of the SWA screen as the sole earth conductor has not been allowed (in Ireland anyway)
for years  :scratch:

When I had a "real" job, it often included work on SWA cabling installed in the 70's
All these cables had separate earth conductors
Really glad to be out of that game now :D

Recently I was asked to change out the cable to a foot pedal on a press brake
I could not believe how skimpy the shielding and insulation is on the "new" sylflex compared to the old???

John
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Project Logs / Re: New Tractor Shed
« Last post by awemawson on September 22, 2017, 11:37:26 AM »
I started the day terminating the ends of the CAT5E cable that were pulled in yesterday but as I was doing it we got a call to say that the concrete lorry was 10 mins away - several hours early ! Luckily we were ready for him.

Access wasn't too bad and the lorry load ended up pretty much in the middle where needed, and Darren then shuffled it about a bit with the digger to get it in place. The 6 cu Metre proved to be almost enough - just a couple of mixer loads to finish the fill of the shuttering.After a bit of tamping. Darren had hired a long pole steerable float which proved OK'ish if a little light weight but it got the job done. Final finish was a brush attached to the pole float, and then my edging trowel giving a rounded corner.
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Metal Stuff / How magnetic is EN56 and the like
« Last post by Will_D on September 22, 2017, 10:26:29 AM »
I am building Harold advanced grinding resty and want to use his magnetc bases update.

As its all stainless steel i would like to use one of the magnetic steels like EN56 (aka 416). [can get magnetic stainless notice boards in A2 or A3 sizes for reasonable money]

Would I get a similar holding force as if I just used mild steel?

Cheers

Will, Dubland.ie
20
Our Shop / Re: A little shop cleaning.
« Last post by Doc on September 22, 2017, 08:16:55 AM »
Hahaha
 She is always a good sport and is there to help.
   
     Unfortunately we did park n it a little too soon so we have spots that came up where the tires set. S I will redo those spots again and wait a little longer this time.
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