Member postings for Robert Atkinson 2

Robert,

If you have a SC and black powder magazine licence I don't see a problem as long as you (or the owner) put the pinfire gun on a SC bfore you assemble a cartridge. Maybe to be 100% do the final loading & fitting of primer at your friends premises or let him do it. You SC will cover the parts. My comment was in case you did not have a SC.

Mick, the cartridge in any weapon is not normally load bearing, at most it provides a seal. Athin wall might jam in the breech but not cause structural failure. Common sense on material thickness should be enough.

Robert G9RPI

Most paper tubes are specified with an ID rather than OD because of how they are made. 0.75" or 19mm is quite smaall First thing that came to my mind was pyrotechnic tubes. looking for inch sizes brings up american sites like https://www.pyrodirect.com/paper-tubes/

Don't know how many you need but you could try talking to these people in the UK
http://www.crayford-tubes.co.uk

Sorry to state the obvious, but make sure you are legal with making these. Firearms offences carry heavy penalties. Cases are probably not a problem but the law is only clear when tested in court. There were custodial sentences handed out a couple of years ago for making ammuntion for vintage weapons. That was deliberate criminal activity (using mini-lathes) but it would not be good to get accused of the same thing.

I would add to Duncan's comment,

Don't release the refrigerant from ANY fridge (or similar device). If it is a domestic unit it almost certainly contains CFC's. It is an offence to deliberately release CFC's as well as being bad for the environment and a potential health hazard. If it's not a CFC it will be ammonia which is a serious health hazard.

For the OP, if the two ports do not have obvious suction and pressure (pressure should be at what you are calling the "thermostat" which I'm guessing is the expansion valve) Then the compressor is faulty. Most likely a valve failure, but could be a fractured pipe or badly worn.

Any fridge compressor need oil for lubrication SAE 32 hdraulic oil used for nmany lathes e.g. Nuto 32, is fine.

If using one of these compressors you MUST fit a safety valve of some sort. If the pressure switch fails (or if left running if you did the unspeakable and don't have a pressure switch) they will generate very high pressures. The running pressures are much higher than the static pressure the compressor will start at and can run to hundreds of PSI due to small piston area and large rotating inertia.

Robert G8RPI.

I did say an INDICATION of location, not your address.

Hi,
An indication of the location of the parts would useful, a inspection is always better than photographs.

Calibration of this type of speedometer depends on the action of rotating magnets on a non-ferrous disk (eddy current torque) The maget strength and distance to disc are critical. If the distance between magnet and disk is fixed the calibration can be changed by de-magnetising the magnet. Age may have already moved the calibration in the right direction. Changing this will not correct the odometer as it is direct drive.

Robert G8RPI.

Just to be clear, I didn't mark the item (a Schaffner System 2050 EMC Impuse generator) up to £1500, I listed it as an auction starting at £50. The market set the price and the buyer (a business) was very happy at £1500 for a ystem that cost over £50,000 new. They even paid for my time, fuel and hotel to personally drive it to Scotland.
I don't make money on everything, but overall my hobby is self financing.

I did get scammed as a buyer many years ago (pre PayPal) over a £500 Tektronix portable 'scope. Buyer looked genuine, had a website etc. I won the auction an sent off a check. Check cleared but no 'scope. further enquires found the address was a "corner shop" informal po box. It was a deliberae scam, specifically targeting test equipment. The police were involved but the supposed fraudster had "spent" the money and had no assets. They added to their criminal record and got a minimal penalty. No one got any money back.
People complain about PayPal fees, but they provide a safe transfer service for buyer and seller.

Robert G8RPI.

I always wait until Ebay are offering a "Max £1 selling fees" promotion before listing anything that is going to sell for more than £50. I do OK on Ebay, I've bought a job lot of test equipment items for 99p buy it know (collection only) and sold 1 item from it back on Ebay for £1500. Seller also let me pick his skip, an item from there went to a dealer for £750, the listed on their site for 4 times that . The seller was closing down and had bee quoted a few hundred pounds for clearing his "hazardous" waste electrical equipment so was glad to get rid. I did OK , I've no problem with the dealer making a profit, he had to calibrate the item and provide a warranty and has premises and employees to pay for.

What annoys me is the people selling dangerous new goods or items that they know are not working properly. That works both ways, computer sellers in particular have trouble with buyers who have an identical faulty item, buy a working one, swap the faulty part and claim the one they bought was faulty.

Robert G8RPI.

+1 for the 1.5mm 4 core SY

https://www.tlc-direct.co.uk/Products/MF1dot5slash4.html

SOD and Pete are also correct about the braid. The braid in SY is not to be used as a protective earth conductor. It's main purpose is physical protection, but it will add some screening t reduce radio interference. The braid should be connected to ground at the VFD end only. At the motor end it should be cut flush to the sheath and insulated with sleeving or tape.
This stuff is part of my day job.

Robert G8RPI

There is no link out from the DVLA website (gov.uk) that I can see. BUT if you search for DVLA tax car on google an ad link to a site related to the one you had trouble with is top of the page.
I can't follow this due to protection on the system I'm using at the moment but it could be a less clear webpage than their main one or even a 3rd party. Perhaps this is what you went to. The SCAM sites are set up to look like the official ones. If they have a page like that then it is improper.

I particularly dislike the amount of click bait and ad links we get bombarded with.

Robert G8RPI.

Having had a quick look I actually I would not call that a scam site. They have the costs clearly marked and are providing a service. Problem is the service costs £5.95 a month and most if not all of what they provide it is available on line for no charge. Dubious value but not an outright con.

Robert G8RPI

Not just a good idea, it's essential that you earth the motor and the metal frame. Earth wires shold only be green/yellow (or the bare conductor in fixed wiring with a green yellow sleeve). Never use brown, blue, red or black for an earth connection.
1.5mm2 should be OK for this application if the saw is supplied by a 13A plug.

Robert G8RPI

Looks like another ill thought out "knee-jerk" reaction to "help" the environment. If cheap wood and coal are restricted there will be even more people burning rubbish like treated wood, painted wood and bonded products like chipboard and MDF producing even more pollution. Wood burners may be a pleasure for some users but may not be for those downwind, especially if they have asthma or other respiratory problems.

Using electricity to directly heat water for a central heating system is just nuts. A air water heat pump is a better option.

If we are going ahead with all this electrification we need a good amount of new nuclear generation capacity for the near and mid term, but no one seems to be doing anything about that. New generation fast reactors that can "burn" part used fuel and stockpiled depleted uranium would be a good option.

Robert G8RPI.

You removed "or carry it around" leaving just the car part.

I just quoted the law on made for or adapted items, I did not say that a grinder met that test.
You are just reading what you want to see, not what is there, I won't be responding further to this.

Edited By Robert Atkinson 2 on 20/02/2020 20:03:51

I stand by what I said, please don't edit what I said to suit your case.
While guidance is that there will normally not be any action without intent, the lettter of the law does not require it. The law (Theft act 1968) also says that possesion of an item made or adapted for burglary or theft is considered intent on it's own. Obviously the case of one in your car depends on you being in or near the car and not at home.
The point of the wording of this law is that it's does not need proof of intent, if it did it would be too hard to enforce. It's basically up to you to show reasonable cause for having the item.
Hopefully it is applied with reason, but you could end up on the wrong side. Try not to fail the "attitude test" for startrers. Finally it's not the police who decide what is an offence or who is guilty.

Robert G8RPI.

Don't keep one in your car or carry it around. You are committing the crime of "going equipped" or to be exact

"A person shall be guilty of an offence if, when not at his place of abode, he has with him any article for use in the course of or in connection with any burglary or theft."

Applies to a lot of tools of course but battery grinders are used a lot for theft including bikes and catalytic converters.

As this is a 12V pump you will need a power supply. Using a variable supply is a much better way of controlling the flow than throttling the output.

If you only have a fixed 12V supply and are throttling the output, try putting a 12V lamp in series with the motor (start with a 21W brake light and swap to a 45/55W headlight if not enough pressure.) This will provide a near constant current supply to the pump, reducing flow (speed) but maintaining torque and thus pressure as you throttle the output. using the lamp will produce less stress on the pump and reduce power consumption.

Robert G8RPI.

The 1:1 drawings are called "Lofts", produced by "Lofting" This was done in the available large open space - the loft.
A key part is drawning curves with flexible strips called splines held in key points using weights. Used for boats long before aircraft.

Robert G8RPI.

DIY EDM

https://www.instructables.com/id/EDM-Electrical-Discharge-Machining/

Robert G8RPI

Edit.This is North American and was connected direcly to the mains supply. If trying this you MUST use an isolation transformer.

Edited By Robert Atkinson 2 on 17/02/2020 10:22:53

That will be a Mill tooth / curved cut file. Used for fast cutting softer materials like aluminium alloy and commonly used for shaping body filler.

Robert G8RPI.