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Post by delaplume on Jun 21, 2020 11:16:51 GMT
That's neat !!...........................3D printing, sort of !!
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timb
Statesman
Posts: 512
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Post by timb on Jun 21, 2020 12:26:29 GMT
Happy Fathers Day to all that qualify, and for those that don't, have a great day anyway!
Tim
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Post by delaplume on Jun 22, 2020 0:36:18 GMT
Thanks for that thought, dear Tim, but alas it was not to be.......... Consider the scene}----It's the middle of this afternoon, all's going well, I reduce the Mini-Mill's revolutions to zero and attempt to turn it off when the spindle speed suddenly goes from 120 ish RPM to maximum...Fortunately there's no auto-feed and I manage to hit the big, Red button on the mains input switch.... Investigations reveal that the combined on/off and "Dial-a-speed" switch has moved in its' housing and crated a short or open circuit...the nett outcome being that it's BACK TO THE HACKSAW for Uncle Alan .................sigh.
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dscott
Elder Statesman
Posts: 2,438
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Post by dscott on Jun 22, 2020 1:01:12 GMT
That is why I love the Dore Westbury switch it on. The lights dim momentarily. And we are off drilling or milling something. I have it on 300 ish at the moment for medium drills. The drill is on 900 ish. and doing 1/8" drills.
I unrolled a more substantial cable in Black and Armoured the other Week. Just needs connecting to the Extension!!! YES!!
David and Lily.
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Post by delaplume on Jun 22, 2020 1:54:32 GMT
Hi David,
To be honest I don't know why they fit this re-gen feed-back system on these Mini Mills.........It's a lot of ££ where it's not really needed.......I'm inclined to gut it all and just have a 240v Variable rheostat fed by a separate No-Volt switch....or something along those lines.
Uh--oh !!---- it's 02.51 .....again !!
'night all..
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barlowworks
Statesman
Now finished my other projects, Britannia here I come
Posts: 874
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Post by barlowworks on Jun 22, 2020 12:04:15 GMT
This morning I lost 2 hours of my life having a diabetic blood test in a tent in the Sheffield Arena car park. How life has changed. Mind you, watching people trying to park their cars in rows of five in the car park kept me amused. It makes me wonder how some of them passed their test or how long ago it was.
Mike
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Post by jon38r80 on Jun 22, 2020 19:20:43 GMT
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Post by Deleted on Jun 23, 2020 8:30:01 GMT
Hi chaps As some of you know my boy's now and then ask me to do a little machining for their modified cars, in this instance, it's for my eldest son's RS Turbo cabriolet. This is an unusual one, I get given a brand new water pump and get asked to machine off the impellor? The reason being that the car is being converted to an electric system and thus the impellor needs removing. Why a new pump and not modify the old? evidently this latest round of mods will increase the RPM to 8k and this pump's bearing is rated for this extra rpm. The pump itself needs to remain as it's part of the belt system, much easier to do this than make up a blanking plate with bearing/toothed gear attached. A couple of pictures, please ignore the swarf...before I could machine off the cast iron impellor I first needed to machine a collar to keep the pump square in the chuck, I used the 4 jaw for this job. This job was done yesterday, today before I can get on with 4472 i best give the lathe a good clean... Pete
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Post by delaplume on Jun 23, 2020 16:21:27 GMT
Hi chaps As some of you know my boy's now and then ask me to do a little machining for their modified cars, in this instance, it's for my eldest son's RS Turbo cabriolet. This is an unusual one, I get given a brand new water pump and get asked to machine off the impellor? The reason being that the car is being converted to an electric system and thus the impellor needs removing. Why a new pump and not modify the old? evidently this latest round of mods will increase the RPM to 8k and this pump's bearing is rated for this extra rpm. The pump itself needs to remain as it's part of the belt system, much easier to do this than make up a blanking plate with bearing/toothed gear attached. A couple of pictures, please ignore the swarf...before I could machine off the cast iron impellor I first needed to machine a collar to keep the pump square in the chuck, I used the 4 jaw for this job. This job was done yesterday, today before I can get on with 4472 i best give the lathe a good clean... Pete Hello Peter.......... That's a very sensible mod. as it takes the impellor's loading out of the equation altogether....At high Eng. RPM every little bit counts....Also having an electrical system allows for a far more accurate control of cooling rates etc...via the "Black Box"..........Have they considered using liquid sodium as the coolant medium ??..........
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Post by delaplume on Jun 23, 2020 16:33:46 GMT
Hello all, As mentioned recently I've had to revert to chain dotting and hack-sawing in order to continue with the water bowser project.......Here's a photo showing the instrument of torture ( the saw ) plus the job in hand and the resultant bowl of a water-like substance excreted from, and about my person...Subsequent lab. analysis shows it to be of an unknown type ( according to Joyce that is !! ).....
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Post by Deleted on Jun 23, 2020 17:56:02 GMT
[quote author=" delaplume" [/quote]Hello Peter.......... That's a very sensible mod. as it takes the impellor's loading out of the equation altogether....At high Eng. RPM every little bit counts....Also having an electrical system allows for a far more accurate control of cooling rates etc...via the "Black Box"..........Have they considered using liquid sodium as the coolant medium ??..........[/quote] Hi Alan I'm not sure of my son's full plan's for cooling or if it warrants the use of sodium. I haven't heard of that being used as a coolant, interesting suggestion. My own car with twice the original power still runs nice and cool, I guess the original design was overkill which is the norm for 80's Porsche's. I am familiar with sodium though as it's used to cool my exhaust valves, that's standard Porsche design for the car, not something added by me. Pete
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Post by delaplume on Jun 23, 2020 20:40:41 GMT
Hello Peter.......... That's a very sensible mod. as it takes the impellor's loading out of the equation altogether....At high Eng. RPM every little bit counts....Also having an electrical system allows for a far more accurate control of cooling rates etc...via the "Black Box"..........Have they considered using liquid sodium as the coolant medium ??..........[/quote] Hi Alan I'm not sure of my son's full plan's for cooling or if it warrants the use of sodium. I haven't heard of that being used as a coolant, interesting suggestion. My own car with twice the original power still runs nice and cool, I guess the original design was overkill which is the norm for 80's Porsche's. I am familiar with sodium though as it's used to cool my exhaust valves, that's standard Porsche design for the car, not something added by me. Pete[/quote] Hello Peter, Sodium filled exhaust valves have been around for some time now---- usually in the form of a loose "slug" within a cavity......thus it gets thrown against each end as the valve reciprocates..............Salt water as a coolant has the advantage of absorbing more heat quantity than plain water due to its greater density......It's also a good agent for Washdown in a nuclear contamination area ( Navy ships have this built-in system for de-contamination ).. Have a look at this, especially the section marked "Coolant" }-------- en.wikipedia.org/wiki/Sodium-cooled_fast_reactorI did Marine basic Nuclear Theory whilst in my last year as a Royal Navy ERA Apprentice and have tried to keep up to speed whilst in Civvy street...... fortunately I don't glow in the dark !!!
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Post by delaplume on Jun 23, 2020 21:27:25 GMT
I'm been cleaning and preparing a 30-year old Simplex boiler by John Ellis.........What's interesting is his early use of rod crown stays ( As per full size practice )........ It's now ready for an Hydraulic test and just needed a blanking plate on the steam dome bush..... With other work on at the same time I chose to order a 3mm circular steel blank on-line... Here's the run-down}----- Steel blanking plate ( 2 off ) = 60mm x 3mm x 2 off............Cost = £3.87 .....P&P = £1.27 Ordered on E-Bay early morning of 21st June.............Arrived at my front door afternoon of 23rd June.. Even without the Virus factor that's good going !! and here is one of them being marked out ready for drilling and fitting tomorrow morning...........All being well we'll have the test results in the afternoon........It's a known performer, the last owner/driver was a steady sort not given to "Le-Mans" type of driving so I don't anticipate any major issues.......... I don't include testing a superheater as it's not part of the basic Pressure Vessel, but will do a separate test if asked to do so......
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Post by Deleted on Jun 23, 2020 21:29:49 GMT
Thanks for the link Alan...it led me on an exploration of sodium and it's properties, very interesting stuff. I won't pretend to understand all that I read but I understood enough to see why it's used as a nuclear reactor coolant...very enlightening..
Cheers
Pete
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Post by delaplume on Jun 24, 2020 4:37:33 GMT
I decided to put in a "Night shift" so here is the Simplex boiler fully blanked and awaiting a 2x Hydraulic Test later today.....
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timb
Statesman
Posts: 512
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Post by timb on Jun 24, 2020 12:24:58 GMT
Pins done, fitted to wheels and wheels fittes to axles - well nearly. I was going to run the lubricator from the pump eccentric but have since read that this would put too much oil into the system. I have decided to fit a lesser eccentric specifically for the lubricator and quarter the wheels after this is fitted, all in one go. Incidentally, as I have used oilite bushes I have a question regarding lubrication. The Oilite website suggests these impregnated bushes are good for 10,000 hours which would be well outtside the possible running time of this loco I would think. The question is should I provide oil holes in the axle boxes or not, and if so, just to the surface of the bush or through the bush to the axle? All answers gratefully accepted, I know others have used oilite bushes before. If I need to drill holes then it needs to be done before the wheels are fitted for keeps. Thanks Tim
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uuu
Elder Statesman
your message here...
Posts: 2,816
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Post by uuu on Jun 24, 2020 12:48:40 GMT
For the oilite bushes on Myford countershaft, the instruction is not to drill through to the shaft - the oil just goes to the outside and, in a few short years, works its way through to where it's needed (in the Pumphouse Myford, the oil level in the cups just never seems to go down).
Wilf
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stevep
Elder Statesman
Posts: 1,070
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Post by stevep on Jun 24, 2020 13:06:02 GMT
I have oilite bushes in the axleboxes of my Rob Roy, and I just squirt a bit of oil behind the wheel. That seems to make its way into the bush, and there doesn't seem to be any appreciable wear after 40+ years.
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Post by delaplume on Jun 24, 2020 16:45:27 GMT
------- and here it is this afternoon holding 200psi for over 20 mins with NO leaks/weeps.......NO bulging crown or deformed sheets....My customer will be happy as I reckon that's good for another 30 years service.....Well done John Ellis 30 years ago !!
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JonL
Elder Statesman
WWSME (Wiltshire)
Posts: 2,912
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Post by JonL on Jun 24, 2020 20:47:04 GMT
I've always liked the simplex. As a kid I used to pore over the drawings and descriptions, not understanding the words but desperate to...
Today I found the source of a very aggressive vibration on my new car. The idiot previous owner put the cheapest tyres he could find on, and they have bulged right in the middle of the tread...
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