Member postings for Dave Smith 14

in

I bought one of these, very happy with it, not snap-on quality but for the price you cannot go wrong

http://www.ebay.co.uk/itm/RED-METAL-7-DRAWER-LOCKABLE-TOOL-CHEST-BOX-STORAGE-ROLLER-CABINET-ROLLCAB-CAB/302482158840?epid=1855477268&hash=item466d5774f8:giEAAOSwWr5Z24UB

Dave

Edited By Dave Smith 14 on 25/11/2017 19:05:05

Simon

Quick internet search will show there are lots of companies offering a scan and print service. Just a matter of finding one near you. It will not be cheap but probably no more than the price of a set of drawings from Reeves or similar. My Aspinal drawings cost me about £60 for 13 sheets.

Dave

Tom

I am a chief designer for an Aerospace company and a chartered mechanical engineer and would be happy to check them over. I can also ask one of our stress engineers to peer review as well. PM me with contact details so we can discuss what data will be needed.

Regards

Dave

I would cut my losses and get it laser cut.

Dave

Great idea, just got a new 3d printer at work, that we are calibrating ( read learning how to use it ). So I think a quick CAD session tomorrow morning and print set off.

Dave

Duncan

Reference the loss coefficient for the entry to a system.

Plain hole eg flat face k = 0.5

Lowest k is using a plain radius of 1/6 the inlet diameter. K = 0.02. Which when applied to the velocity head loss reduces it to next to nothing. Hence the reason a bell mouth intake is used on engine intakes and the entry to a venturi.

Reducing the radius increases k but it never exceeds 0.5 (r = 0).

Using a taper gives good results, it is easy to get down to a k of around 0.1/0.2. Whilst this is an order of magnitude higher than the bell mouth, html the difference in the total system loss would probably not be measurable.

One thing to think about is how are you going to calibrate it all?

Ian

My X axis is the same and you loose about 20mm (in my case) off the y axis. If I recall I looked at installing on the front, but the x axis locking levers get in the way.

Dave

In my experience buying new you do not get money off the machines, but they throw in accessories. I bought my WM16 at one and they threw in the machine vice, a set of mt2 collets and a set of end mills. When I bought the band saw, I got spare blades. The second hand barn is always worth a visit. They have used machines and lots of other bits and bobs. At the last one I got a virtually new HV6 rotary table with a chuck already fitted for £90. The chuck alone is £80 new. But get there early before it opens to get the bargains.

Dave

Just replaced my caliper style scales with the Warco System. The calipers eat batteries, 15 mins sometimes, would reset mid cut etc. The Warco system is mains powered so no batteries to worry about. I paid a bit more than the equivalent on Ebay but went for the customer support. Very pleased so far.

Dave

Catia V5. I have on my work laptop.

Hi from Cowplain, another newbie just starting a 5" gauge Aspinal, but a 30 year modeller in 4 mm scale EM gauge.

Regards

Dave

Neil

The app says I have to buy the latest issue, I am unaware of my subscription having run out, no chase emails, I recon I am only 6 issues into my new subscription and I have access to it via the ME site? I need to read it on the app as the last years worth of copies only loads blank pages on my tab 3 tablet when trying to read from the site (laptop is ok). Any idea what is wrong or how I check my subscription?

Regards

Dave

Eileens Emporium

Bending Aluminium, you must be very careful here as the acceptable bend radius depends upon the grade of Aluminium being used, its temper, its thickness and whether you are bending across or with the grain. Stronger the material larger the bend radius. Typically the Aluminium Association suggests you can use 2 x thickness (2t) for 6082-T6 sheet up 1.2 mm thick. However do that at your peril, if you bend across the grain you may get away with it at 1.0 mm thick but 3t is required to achieve consistent results in all directions at that thickness and 4t from 1.2 to 1.6 mm. Of course heat treating changes all that, but introduces a whole new set of problems.

Regards

Dave

Chris

You are correct it was that fuse, I checked this morning before going to work. I originally discounted it because the rpm counter was illuminated and assumed it was fuse for whole supply. It seems it just protects the motor supply. Luckily my new WM16 mill has just turned up with some spare fuses. Thanks for the help.from everyone.

Dave

This was bound to happen as a new starter. I thought I was engaging the cross feed after starting a facing cut on some ally bar. Engaged the carriage feed instead lathe stops! Switch it all off. Tried to restart, I get power through to the control panel and rev counter reads, but motor does not start. I hope this is only a fuse or something. I am sure I saw something about this in a thread but searching does not bring anything up. Can anyone help please

Barry

I was going to build the tender version and bought the photo copies from Reeves. I am now building the Aspinal instead so they are surplass to requirements if you want them.

Regards

Dave

Nick

I too am just starting out on the journey of building my first engine, in this case Don Young's L & Y Aspinall Class 27. I cannot help you with build errors, but your approach is a logical one and the same as mine. Don's Design are reputedly pretty good, but this particular engine has no build articles, so info on the accuracy of the drawings is sketchy. Hence I am remodelling the loco in metric (where appropriate) and as a 3D model, using in my case CATIA. As well as checking to make sure it goes together, what dimensions are missing etc it gives a really great insight into understanding how it works. I have started with boiler assembly and the picture gives a quick flavour of where I have got to. Good luck with your build.

**LINK**

Dave

Involutecurve

Please do not use Alocorom, Alodine or any other Chromate conversion process at home. These products are known carcenogens and under the EU REACH programme will be outlawed in 2017 along with chromic anodising due them containing Chromium 6. It is real pain to those of us Aerospace. There are alternatives to Alocrom now that are REACH compliant which off hand I cannot remember the name but an Internet search will find them.

Regards

Dave