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I offset it the .064" first and did the 1/4" hole then the thread & counterbore close to the .410" depth, then trued it up and finished the big cavity with a homemade grooving tool.

I just happen to be in the right place at the right time to see a colleague moving his Aciera F1 Milling Machine into storage and ask if I would like it as he didn't use it much and need the space for house renovations. So know I have a very nice Mill to play with over the xmas break. It had a...

G'day from up the Road

1 Module is correct

I found the same issue when I modelled it. I moved the hole by .02" to .370", now it just misses the valve cage hole.

Is the hole that operates the walbro's diaphragm pump in the aluminium. It may be starving for fuel

Strictly IC Magazine KIRK MINIATURE DYNAMOMETER, by Bud Kirk & Bob Washburn. A Hydraulic (Mechanical Water Brake) Dynamometer. Issues # 62, 63, 64, 65, 66, 67, 69 & 70 Paul

Nice job on the drawings, I did find a errant dimension.

It measures length 47MM, width 29MM, high-46MM, weight 66G. Flywheel diameter 29MM, shaft diameter 2MM. Cylinder diameter 4MM. Mini SteamEngine(M81)Live Steam - $68.00 microcosm-engine.com

I received an update email yesterday @4:32pm

One of our members at SSME Model Park wanted some custom alloy rims made. Turning was done on a Tormach 15L Slant-PRO cnc lathe.

A article on builbing a Electromagnetic Etching Pen was published in Model Engineer Vol 171 No3952 September 1993

FYI The End of an Era Sadly, the Australian Model Engineering magazine has come to an end. The growth of the digital world and in particular social media has finally taken its toll, and like many other magazines AME has now fallen victim. Issue 214 (Jan-Feb 2021) which is being mailed next...

$6 will get you a digital copy, https://www.modelenginebuilder.com/store/p23/issue-20.html

Hope this Helps

It looks very similar to the "Westbury 10cc flat twin cylinder"

Its the 30cc Sealion it can be found at https://grabcad.com/library/sea-lion-30cc-petrol-engine-1

9 holes on 15 hole plate 12 holes on 20 hole plate You were nearly there 90/150 = 3/5 of a turn http://www.bilar.co.uk/cgi-bin/division-calculator.pl

https://www.homemodelenginemachinist.com/threads/compact-micrometer-boring-head.31250/ Construction articles by G.A. Harding on making A compact micrometer boring head appeared in model engineer in Jun/Jul 1982. issue 3684 & 3682

Construction articles by G.A. Harding on making A compact micrometer boring head appeared in model engineer in Jun/Jul 1982. issue 3684 & 3682