Member postings for Paul Lousick

British Standard Pipe (BSP) is specified by a nominal diameter and a schedule (wall thickness). While the wall thickness varies, the outside diameter remains the same so it is compatable with all screwed fittings for that size pipe.

Your example is more likety to be 1/8" copper tube which is specified by its OD and a wall thickness.

Lots fo brass fittings available for tube. Solder on, Clamp with an olive or flared ends.  Adaptors to BSP threads, Tees, Elbows, etc.   Do a search for capillary fittings or Brass tube fittings, etc.

Paul

Edited By Paul Lousick on 10/05/2021 12:19:45

I have not used one of these but it should be fairly rigid when the clamp screw on the side is tightened to close the dovetail.

An internet search has lots of similar toolholders using a wedge screw to clamp tools instead of the slot. Details to make your own shown here. **LINK**

This version with the slot is a simpler version and should be just as good.

Paul

Edited By Paul Lousick on 09/05/2021 12:35:09

It is very easy to downsize (or upsize) drawings/models if they are in CAD by applying an overall scale feature to produce a drawing at a different scale. Then a matter of modifying to use the available material sizes.

Paul.

Multiplying dimensions by 0.7 will scale down the drawing but you then have to round the answer to a size that will match available materials.

eg. 5" scale drawing uses 1/2" plate = 0.35" at 3.5" scale. Nearest imperial plate is 3/8" [0.375"] or 8mm [0.315"]

or 5" scale drawing uses 1/4" [0.25"] bolts = 0.175" at 3.5" scale. Bolts this size are not available and you have to select something different.

Everything on the drawing should be checked to compensate for these changes. Unless it is critical to achieve an exact scaling down of the drawing from 5" to 3.5" you may want to round lengths to whole numbers. Bearing in mind that your 5" drawings are probably an approximate scale of the original full size drawings.

Paul.

Edited By Paul Lousick on 05/05/2021 06:36:54

I second the use of kitchen cling film. Not just for polished brass but steel as well to prevent rusting prior to painting. Also use it to wrap finished parts in to prevent scratches and dings.

I have seen them but only on DIY forums. You may have to make your own.

Paul

Why such a big taper? Why not use a boiler without a taper ?

Boilers were originaly made this way because tthey were too long to roll out of 1 sheet. Instead they were made by rolling a number of shorter lengths with a slight taper so that the smaller end could fit into the larger end of the next piece and them rivetted tobether. (or are the BR boilers different to most others). I assume the boiler will be lagged and you won't see it anyway.

Paul.

Chris,

How did you hold the 10mm end mill to do the final (skim) cut. In the drill chuck or in a collet ? A drill chuck is not very rigid and will make an oversized hole. Standard size reamers are not expensive. Making a D-bit out of tool steel is not difficult if you have a mill and lathe.

Paul.

There is something that is not clear to me in the photo above with the 2 boring bars. The cutting edge on the HSS tool is facing the front which is normal. But if the brazed cutter is meant to rotate in the same direction, the carbide tip appears to be brazed onto the back of the spindle. (brazing under tension). They are normally at the front and supported at the back with the braze under compression. (or am I seeing things). 

Note: If the boring head is screwed onto the spindle and has a side mounting hole for cutters an opposite handed tool has to be used otherwise it could unscrew while cutting.

Edited By Paul Lousick on 24/04/2021 10:58:29

Mine works without posting a message to the thread.

The Mars probe is estimated to cost more than $2.7 billion. Would you choose a cheaper option for making electrical components and have something fail ?

A reference for improving our soldering techniques.

NASA Technical Standard: Soldered Electrical Connections

**LINK**

I use 45% silver solder for joining steam fittings and fabricating valves but it is expensive.

15% Silver alloy rods are normally used for plumbing applications like copper pipe, hot water tanks, plumbing fittings, etc. Excellent for gap-filling where close fit-up does not exist, and where thermal expansion and service vibration are involved. Melting Range: 645-800°C.

45% silver alloy rod for general purpose, high-strength joining of all ferrous and non ferrous metals, including steel, stainless-steel, copper, brass, nickel, etc. High fluidity & rapid capillary flow, good choice where parts have a close fit. . Melting Range: 640-680°C. (used for making copper boilers)

Even though the bayonet connector should be self sealing, it's probably worth checking for leaks by spraying with soapy water and checking for bubbles. Especially if it is indoors.

Paul.

The retaining caps should not be too tight because the glass can easily be broken, hense soft neoprene rings as Chris has suggested. Normal o-rings are hard and require reasonable force to compress. Sometimes used on full size boilers but not suitable for small fragile models.

If you are unable to find suitable neoprene tubing to make rings, you can use flat teflon sealing tape by twisting it into a string and wrapping the string around the glass. Not as good but will get you out of trouble.

Paul

Its been a while now that we have not been able to print from the digital magazines and and it is still not fixed and they seem to be doing nothing about it.

I have already complained to Pocketmags and now suggest that every reader do the same and put some pressure on them to resolve the problem. If they get enough bad publicity, they might pull their finger out and do something (sorry about the language) but I feel that we are being robbed of what we have paid for. If it can't be fixed, we should be compensated for not receiving the full product that we subscribed to.

Paul.

My Brother MFC-L2700 printer/scanner/copier is about 7 years old. It has duplex printing, scanning and WIFI. I use 3rd party toner cartridges which are reasonably priced. Lost count of the number of pages printed but estimate about 20 - 30 thousand.

Macc Models **LINK** sell gauge glass with diameters of 4, 5, 6 & 7mm

G'Day Joe,

I cannot help you with Bradley's drawings but this link to previouse posts may help with drill grinding jigs.

**LINK**

Paul, Sydney, Australia

I have been having the same problem. Tried it on 2 different computers, using Firefox and MS Edge and contacted The Pocketmags help desk and received this answer:-

Thank you for your email!

We have recently been contacted by a large amount of publishers regarding a change in their piracy policies which we are trying to resolve. So some titles currently have printing suspended but we are working to get this feature back up and running as soon as possible.

We apologize for the inconvenience but with the upcoming changes we are looking to make page printing more user friendly and to allow for the PDF printing for a lot of titles.

Please note this is not permanent and will be available very soon.

Warm Regards,

Pocketmags Customer Service