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Member postings for Nathan Sharpe

Here is a list of all the postings Nathan Sharpe has made in our forums. Click on a thread name to jump to the thread.

Thread: Phase convertor problems
21/11/2017 18:22:54

John. I should have explained that the heater was there because I initially suspected a damp motor/workshop was to blame. I eventually took the Silverdrive apart , I found that a lot of switching was carried out by reed switches of unknown quality. These were replaced and all was fine until the also cheap pcb, cracked after 6 years. I replaced it with Transwave after too many repair sessions!

Clive. I've never had a moments hesitation from the Transwave from day one. The Harrison is still on it's original starter . If I have to do anything at all to start, I may have to adjust the boost/voltage control in cold weather. I wired the workshop and installed a circuit just for the lathe , no domestic light or power problems , my own installed VM shows voltages within the regs . Nathan.

20/11/2017 19:50:38

I have a Harrison L5 with the dual speed motor, it runs perfectly on my Transwave Static Converter as it did eventally on the original Silverdrive unit I bought. Have you set the selector switch correctly to give as close to motor voltage/slightly over? Do you keep the motor warm? I have a small tubular heater wall mounted next to the motor and it seems to help. This heater was fitted because initially the Silverdrive had the symptoms you describe. Nathan.

 

Edited By Nathan Sharpe on 20/11/2017 20:00:02

Thread: 5 ft diameter copper rings.
09/09/2017 19:31:07

Take it to a local steel playground/street furniture company. They may have a ring bender.

Thread: Where (apart from ebay) to look for a pillar drill base?
21/08/2017 18:48:31

Can you post a photograph please. I have the base and column off my old pillar drill but it's only 2 1/2 inch diameter. Both are fairly heavy but you're welcome to them if you want to try and make an internal adaptor for your column. Nathan.

Thread: 2040 deadline for Diesel and Petrol cars.
26/07/2017 19:34:49

Duncan , we still do generate from landfill gas. Of the 5000 odd registered landfill sites in the UK (most of which are no longer taking waste) about 2000 produce 14/16% of our energy and will do for about 15/20 years depending on the site in question. This energy should be classified as "Green" but politically is classified as "Fossil Fuel" energy. There is no subsidy paid to these sites to cover over generation shut down (the national grid cannot take the power) as there is to wind farms. It seems to me that gasification plants/incinerators are not the way ahead given that the majority of plants are having to import shiploads of Baltic and American softwood chip to initiate and maintain the burn so that our DAMP, not wet household waste can be burnt. At all UK plants output is much lower than predicted and in some cases will lead to shut down. This will not worry the plant owner because they ARE compensated for their system being unable to burn "waste that is beyond the moisture content that was agreed" and also paid to import softwood chip to maintain the political nonsense that said burning is better, they even place the sensors in a place that most people would not climb to inspect and instead rely on honest operators! At least in landfill inspection is easy and they can be monitored very closely without massive costs, their contents can even be recycled from the liquid (leachate) produced. I have just retired from 15 years worth of design and CQA work in this field and prior to that I designed leachate extraction systems for landfill. Nathan.

Thread: Electrifying a distant garage
26/06/2017 21:11:15

Sorry, I should have added that it's the cost at either end of the cable that will seem expensive ! Nathan.

26/06/2017 21:08:24

For what you want you can get away with 6mm/2 3core swa/pvc. That gives a 4.7% voltage drop at 65mtrs clipped direct or buried. Fitted in free air should be similar to clipped direct. Not vastly expensive if you fit the run yourself and are not living on pensions, it should cost about £2.80/mtr and £4.00 per gland pack. Nathan.

Thread: Help please Windows 10
16/06/2017 21:29:14

If I right click I get a slow computer which eventually goes to black screen and them redraws to desktop. I have had no major problems with Win 10 apart from printer networking from her laptop. Nathan.

16/06/2017 21:16:10

Can anyone help please? I'm a pump engineer NOT a computer geek so please do not doing a comparison between operating systems. I run my pc and her laptop on Win 10. My pc will no longer allow right click actions to take place , her laptop will. I have tried button priority with no positive result , I can see restore points but cannot reach them because they require RIGHT click. I am unable to use right for any action in any saved document or photo. I cannot even read the file exif data (photos). Can any of you help? Please. Nathan.

Thread: Telescope project
11/06/2017 22:28:01

Sorry Stuart, not enough info for something that impressive ! Could your "happy astronomer" inform us please? Nathan.

Thread: CO2 Mig welding bottle
07/06/2017 22:21:32

Hello again Brian, have you considered the BOC/Volkszone deal? Initial cost 2016 was £82.50 and this years invoice was rental only at £54.00. Refill cost is around £35 for a Y sized bottle. Nathan.

07/06/2017 22:10:24

Hi Brian, I don't know who in your area but most local/small/family run fire extinguisher service firms are worth phoning. They tend to decant/refill the extinguisher charge bottles themselves and (round here ) are happy to recharge after test or if the cylinder is still within it's test date. I used to use pub gas and had no problems with refilling. Nathan.

Thread: Citroen and his gears
01/06/2017 23:36:16

My best try is a two part rim/tyre construction pinned together and also fairly flimsy when looking at a collapsed tooth on the third gear from the left (foreground cluster) above centre line. Nathan.

Thread: Continuous use of a phase convertor.
15/05/2017 23:10:39

Evening all, I finally have the time to report on my end result. Our suppliers visited site, looked at what we had installed, laughed and went away. Now , nearly six weeks after their visit, a design arrived with their quote, for exactly what we had already installed! They even use the same inverters as us with external controls connected in the same way. We decided to decline their offer to build and install by the end of June and were horrified by the cost which was greater than 4 times our cost for a now working system. The inverters seem to have had component issues which are now solved , we were sent 2 FOC to fit and had our originals repaired, again FOC. Nathan.

Thread: Cubital tunnel sydrome or ulna nerve entrapment
07/05/2017 21:31:47

I've had it for about 20 years. When I attended my hospital referral I had the electrical tests to determine the area before seeing the surgeon . After having the risks of A) severing the nerve- 20%, B) causing further non nerve problems like loss of elbow mobility - 20% , C) partial cure- 35%, I decided not to go ahead with the operation. My numbness changes depending on both useage and temperature, leaning on my elbow makes it worse and being hit on the "funny bone" is not funny ! I can still play guitar and form chords/select notes/pull off etc but with reduced strength , I'm right handed and my problem is my left ulna nerve. Keep it warm, try exercise and use NSAIDs such as Ibuprophen and try not to use the arm rest when driving. In the workshop I have very few problems with it. Nathan. PS. if you have or have had heart probs and you are taking long term medication, check with your GP before self medicating with NSAIDs.

Thread: Making work equipment.
31/03/2017 21:43:01

Joshua, yes these were large bore suction hoses up to 6" dia . For the 12" and 24" hoses the Bendix units were doubled up . We used to check the pump "suction" with a vacuum gauge fitted to a drilled through nrv ball of the correct diameter, pumps were deemed ok for hire at 20/25 ft vac. Nathan.

Thread: Tools you Treasure
30/03/2017 20:49:19

Clogs , I know what that feels like. My old man left it all to my half sisters father (house included) to look after his daughter after my Dad died. My old man raised her as his own after mother died . Her father put her in "care" and sold it all , went on the p--s and forgot about her. We , all three children, knew nothing about varying parentage until 1996 when we met up for the first time in 25 years when she noted a difference. When our mother died my (full) sister and I went into"care" because of fathers age , youngest (half) sister remained with her father (living with us) and my father. When she found out she went on the "p--s" also , on his grave. Nathan.

Thread: Making work equipment.
30/03/2017 20:30:25

To the best of my knowledge Godwin pumps used (and probably still do if Godwins still exist) a venturi air extraction/vaccum pump on their engine driven centrifugal pumps to evacuate air within suction pipework. This was driven by a standard Bendix 2cyl compressor into a jet at 90 deg from a similar jet on the suction hose side , the air was ejected via a shaped nozzle at 90 deg from the suction nozzle. These were not CE marked as an individual component/system (circa 2003 ) but CE compliance may have been due to the whole pumpset being CE compliant. If I remember correctly all items were standard Bendix part no's. We had a leachate Eductor system as part of the hire fleet (SLD pumps) which used the same system. Nathan.

Thread: Continuous use of a phase convertor.
30/03/2017 19:59:43

Evening all. Mark, I wish we could go that way but the cost would be prohibitive! Like Muzzer ,I prefer one VFD/machine. I do normally have to share the control circuit via a "flip/flop" or switching relay and yes all circuits are debounced. The currently faulty inverter has been sent back to the manufacturer for testing and repair/full report. We will continue to support this manufacturer because of their support system. The system is working as designed but on one pump. We have asked another of our suppliers if they could supply a standard panel with phase conversion built in and their answer was "We do it all the time " , so a site visit has been arranged and I will await their design with bated breath ! They tell us that their solution fits within an existing panel (Theirs) alongside of the standard control gear, I will report back to you all if this is something which could be a legit solution for my problem and,I suspect, many problems suffered by others on here who need a non inverter 3ph supply. Nathan.

26/03/2017 22:26:10

An edit to my previous post. We design and install inverter driven water pumping stations where I can give more info via pressure/flow/level sensors to the inverter to prepare it for a start and to allow it to monitor these parameters and therefore deal with them before a sensor driven stop. With sewage being pumped into a" public" sewer we are pumping into an open ended pipe so we do not have the gradual increase in pressure to work with, flowmeters cease to read even with Magflow units and ultrasonic level controls are thrown into disarray because of the very "splashy" flow into most private sewage wet wells. We rely on float switches, a coarse on/off action, which could happen and does happen to the upper float quite a few times before a positive on switching is achieved. We do loads of sewage work ( the majority of our work) but prefer a standard DOL/Star Delta system for both single and three phase stations. This particular job has no 3ph supply available but my boss has specified 3ph pumps to the client. Nathan.

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