Model Forum / General / Models / June 2007

I am rewiring a Mec Brown 415v dual speed cold saw, replacing the
speed change switch, and the Pedrazolli wiring diagram that came with
the new switch doesn't work !!! One speed works ok, the other growls
slowly backwards.

I'm trying to drill a 1.2mm hole through a brass Crossman 2250 trigger
"edge on" following the black line: -
http://www.ora8i.rivington-riflemen.org/Images/ratty2007/trigger-drill-line.jpg
and I'm still busting drills.

I'm slowly amassing the parts to buiild an 8' x 4' CNC router and most
of the designs I've seen have dual leadscrews on X.
What are the mechanics of driving/synchronising these?
If we construct a crude 'flow diagram', it would go:

Just heard on  the 6 pm news that the EU have backed down on forcing the
UK to make selling anything by reference to imperial measures illegal by
2010. They said the present derogation will be extended indefinitely.
Don't you just love it when bloody bureaucrats get put back in ...

Was there a recent (last 6 months or so) article about Centec milling
machines in either the Model Engineer or the Model Engineers Workshop?
Or is my poor ol' brain off on one again?
I can't remember...

The recent questions on CNC have me wondering about servo motors, What
type are normally used DC brushed motors or AC motors, just wondering as I
have 3 AC style and wonder if someone has a use for them before I see how
good they are as wind turbine motors?

Grumman Albatross Float plane Plans
Does anyone know where I can get the blue prints/plans for the Grumman
Albatross float plane?  Any help will be appreciated.
Ray

I'm going to build a 1/25 scale '65 Riviera, but I wanna chop the roof off.
Has anyone ever attempted making a convertible out of a stock kit?
Any suggestions as to what type of material to recreate the folded up roof?
Regards,

Can anyone tell me the thread size on an ER20, and ER16 closing nut,
please - I've found all the dimensions for the collets, but not the
nut.

The eBay seller  of 1/25 Tamiya tank models quotes US$40 to 50 to ship
to US-Canada.    Is this a reasonable S&H charge?    This will be more
than recent successful bid price of the model itself.

I don't really care one way or the other, but this doesn't look entirely
kosher:-
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130122633940
Mark Rand

I'm after a Bristol Erickson "Acramil" collet chuck in 30INT
Did they make them?
All suggestions welcome
Thanks

Here`s a link to a pdf manual published by the Hercus Lathe Co which
gives a fair bit of detail on lathe tools and how to use them.
I have copied the link from the Practical Machinist site where it was
posted by "Paula"

Just released, a 1/144 scale model of an asymmetrical nuclear powered
Northrop flying wing design from 1956:
http://www.fantastic-plastic.com/NorthropNuclear-PoweredFlyingWingCataloguePage.htm