By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for Marcus Bowman

Here is a list of all the postings Marcus Bowman has made in our forums. Click on a thread name to jump to the thread.

Thread: Thread Milling
29/08/2013 23:28:51

As far as I understand, if you are moving "normally" in X, Y and/or Z the same feed rate applies to the movement of the CP within that co-ordinate space. I think that means that if you are moving anywhere in X, Y or Z (including at an angle in two or three of those axes simultaneously) movement occurs at the feedrate set by the F command.

There is only one F command, so it is applied to X and/or Y and/or Z and any combination of those.

If you are using one of the other feed rate modes like inverse time mode, I believe different rules apply.

The more interesting question is how well does the control software cope with acceleration and decelleration while thread cutting? A first guess would be that it copes fine. A caveat is that some CNC-cut threads seem stiffer in the mating thread than they should be, and although this might be because the depth of cut is not adequate, the feel of the thread suggests the depth is fine and it is a problem with the approximations.


Thread: Is this the trend in small locos?
29/08/2013 23:05:24

Ian T mentioned G1MRA, and I can confirm that the steam v. electric debate does rear it head in that group from time to time. The electric loco owners sometimes feel the live steamers believe themselves superior. That's an old chestnut in any gauge, of course. It's not as big a debate as you might imagine, though.

Because G1MRA is the nearest of the ME gauges to the model railway camp, where everything is electric irrespective of the model, there is much more interest in model railways as opposed to simply building a loco and runnign it on rails. So scenery, coaches, and the whole environment is involved, and that brings other aspects to the modelling. Aside from the Gauge 5 Ground Level Association, I see no such interest amongst model engineers.

There is no doubt that we are headed towards a future in which there will be an increasing proportion of steam outline models which are electric powered.

As Chris Parsons notes, electric aircraft have been largely accepted and there is no real issue there, apart from shorter flight times.

I tend to feel that a model should be true to its prototype, with a steam outline loco being steam powered, but the advantages of the electric loc are very considerable.

Gauge 1 locos, both steam and electric are often radio controlled, and they are much further down the road of RC control than the other gauges. I think we are missing a trick, here.

In the larger gauges, the other big change that may come with electric power is much more Modern Outline locos.

We are seeing this already, and I believe it is the beginning of an explosion which will change the hobby. Some won't like it; while others will be drawn to the hobby because of the modern outlines. Those are all post-steam locos anyway, in real life, so the power unit matches the prototype.

I think steam is becoming less popular because of cost, and because of regulation. I am not sure we can do much about either.

What is apparent, from aeromodelling and from model boats, is that there are lots of people out there who will find the hobby more attractive if they can buy a ready-made electric loco and get going quickly.

Unlike aeromodelling or model boats, though, those new entrants still ned to use a track. Gauge 1 and, I suspect, gauge 3 have a greater prevalence of private tracks. That's not true for the larger gauges.

I suppose it all depends on what you want from your hobby. I like to make things. I would hesitate to make an electric powered steam outline loco, but I am happy to admire any model that anyone has taken the trouble to make.


Thread: 3D in MEW
21/03/2010 22:34:57
For the parallel viewing type of drawings:
look straight ahead
hold the page at reading distance or arms length, but just below your line of sight
focus on a point far far away (like the next street). That will mean you are focussing beyond the room, and it takes a little practice.
Once you can hold this distant focus, move your arms up to bring the page into your line of sight. That should give you the 3D effect.
Holding your focus while moving the page up is tricky, until you have the technique, but once you see it, you will be able to do it again easily, anytime.
Alternatively, hold the page in sight, at arms length; then focus well beyond the page.  Like the first technique, it takes a little practice, but it does work for 95% of people, and its easy once you get the technique to work.
Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
Eccentric July 5 2018
Allendale Electronics
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest