Posted by William Ayerst on 11/11/2020 16:57:33:
Ah, interesting. I will look at those sites also. My question still stands however, how much should I expect to feasibly fabricate vs buying as castings (regardless of prototype or gauge, and obviously – on average. I'm sure it will vary from person to person but a thumb-to-the-air estimate will be very helpful)
There's a huge unknown in the equation, which is William Ayerst!
There's a lot to learn and some people are naturally better at reading plans and machining than others. Progress involves a complex mix of skills, experience, facilities, time, money, determination and problem solving.
I'm not a natural. My first go at anything has a high failure rate but I'm much faster after the second or third attempt. Even though not a beginner I work more slowly than many on the forum. Not false modesty but I reckon JasonB works at least 5 or 6 times faster than me and his output is better finished too. He's not the only one.
Most things can be fabricated, but it takes longer and is likely to cost more. Castings are semi-finished and less metal is wasted as swarf. I always fabricate.
I learn best by starting simple and working up. I wouldn't dream of tackling a loco as a first project. Not lack of confidence, rather knowing that the build could take years as I learn on the job. Others relish the challenge and are energised by working towards big rewards. Depends on personality.
Overreaching early on has scuppered many a promising Model Engineer. The late great John Stevenson sometimes recommended accident prone members to take up knitting. As a series of 'just too difficult' defeats is demoralising and expensive I feel happier avoiding pitfalls by preparing and training. For example, interpreting drawings is a skill in itself. Much easier to spot mistakes in a complex set of drawings after building several simple projects, ideally from dodgy plans. I like to redraw plans before starting, ideally with 3D CAD. Incorrect dimensions, missing reference points, interferences, mirror images, impossible to fit, misprints, ambiguities and misunderstandings. It means I started by learning to draw…
Then there's learning to work effectively with several tools and different materials, some of which are downright awkward.
Not rocket science but a great deal of simple when you know how. Not knowing what you don't know makes estimating how long a project will take really difficult. Making something simple first is highly informative; one gets a 'feel' for jobs, success rate and personal stamina. If a Stuart 10 is knocked off in a week, the future is rosy. If it doesn't run after a year…
Dave