Here is a list of all the postings RichardN has made in our forums. Click on a thread name to jump to the thread.
|Thread: How accurately can you machine?|
Has anyone on here any thoughts on the difference between these two methodologies for obtaining repeatability?
1- first cuts take relatively deeply- maybe 30thou/pass, then as you approach the final measurement make progressively lighter passes, 15thou, 5thou, then shave the last thou to suit.
2- take first cut at around 10thou, measure before and after so you know what that tool actually removes at a pass (which may vary due to sharpness, material, speed, time of day etc) then remove whatever amount is required allowing for a final pass or two at the 'known' depth of cut.
I assume 1 thou cuts with a dull cutter are just rubbing and polishing, so not guaranteed to be reliable and consistent?
Edited By RichardN on 06/06/2016 18:50:23
|Thread: Draughting Pens|
Unfortunately Rotring no longer make the 'gold' series for film- which from memory have a carbide tip for wear resistance rather than the conventional steel. I still have 2 gold pens, but the rest are conventional.
I am 30, work as an architect, and probably do 15% of my work by pencil & pen. There's a time and a place for everything (most things..?) and a romantic quality can be instilled in CAD work just as well as in a pen drawing- but it's quicker and easier by hand... Sketch and scribble for a first draft, work up detail in CAD, then final iteration for presentation with hand detail for the visual impact.
|Thread: Flying Scotsman's schedule to be kept secret|
But if you do want to see the train, local newspapers help by publicising the route with outline times and dates!
|Thread: Help in identifying cutting tool|
Ah, many thanks for that- I had been considering chopping it up to keep the carbide on a simple shank for chamfering purposes... I will now have to keep it in the hope of one day finding enough of a holder to use it!
Fairly new to this whole model engineering lark- but think I'm getting the hang of it. I'm making an Edgar Westbury Trojan, so started making a Harold Hall grinding rest to sharpen the tools to make the engine- and have spent the afternoon making a fly cutter to help make the rest to help make the engine... Very satisfying despite not actually making what I set out to do...
Anyway- picked this up at a carboot sale for free- I saw the glint of carbide in the bottom of a box of rust... The carbide has a roughly 80deg included angle, virtually no top rake, 1/4" along the longer edge, and a graduated dial behind the cutter. The threaded shank is approx 1/2" and pretty fine pitch.
Any one any idea what it is from/for?
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