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Before long I have to overhaul a Briggs and Stratton lawnmower engine. Specifically, I have to get the valve seats tight in the case again, it is an alu case side valve engine and the valve seats rattle around in their pockets in the case. I think I need to make some new seats with a slightly...

You will be able to cut superb paper gaskets with a Co2 laser, you will not even touch in any meaningful way either copper or aluminium. However, you can do very nice engraving (well not actually penetrating the metals surface) by using sprays such as Cermark. K40 Whisperer is good and can load...

With Polycast they chemically polish the lines out, melting the surface would be another way to describe it. My tests with Polycast prints seem to confirm this, now to shelling the parts and casting.

With Polycast they chemically polish the lines out, melting the surface would be another way to describe it. My tests with Polycast prints seem to confirm this, now to shelling the parts and casting.

You should look at MOI 3D it is developed by a chap who worked for Rhino and it does pretty much everything that Rhino does without the clutter.

Peter I have to agree with Jason on your appraisal of 'toy' CNC machines. There are some superb parts for small engines being made on even Sherline and Taig machines. On a slightly different point, Sherline even use their own machines for certain single operations in making the machines in...

I have worked on some powerful electric motors (upto 11Kv and 10,000 Hp) but never a motor with such a large diameter and short stator/rotor length.

GreenTwin I think you might have covered this, but I would say that creating the sketch in a 2D programme does create extra work if modifications are required. I completely understand your workflow and I occasionally use it for importing unusual sketches that already exist, it is not my...

Very nice.

GreenTwin I have read quite a bit of the recent threads and taken in your unorthodox approach to importing 2D sketches from AutoCad, all I can say is that it clearly works for you. I would add that AutoCad had a 3D modeller called Mechanical Desktop, that programme was so rigid that it would...

Mike How large is the nameplate, there is no idea of scale. B.

Gary I have no idea about those particular engraving bits but I have used a tungsten carbide engraving bit with similar geometry with good success on aluminium, stainless steel and titanium. The particular machine I sued only had a max 3000 rpm spindle. In titanium I had 0.35mm DOC and feed at...

Nice workshop, very welcoming.

Nice work there, I learned to fly RC using a OS Max 30 back in 1976. Are you using the engine for CL stunt? B.

Your idea of self-education using a smaller machine is good, I done this nearly 30 years ago with an Austrian CNC system called Step Four, I don't regret a penny spent or a minute invested in my education in these matters. I would further add that by careful choices of equipment bought that I...

As Jason says you need to have some idea of what size parts you intend to make. I also have a gantry CNC router and make lots of larger flatter parts on that, but it is highly capable in 3D machining as well. I would advise against any machine or system that can only handle 2.5D. My machines...

I thought Optimium had CNC options? I guess you are machining metals rather than wood or composites? I have a Wabeco CNC mill and that is pretty capable and has all of the control's setup from the factory. I have recently started out with an EMCO PC Turn 50 CNC lathe and that is nice but you...

Olli Are you looking for a CNC lathe or a mill?

Yes it is a Tracer, we fly them with 32's now just with a silencer, it is great fun. I also fly CL speed. The photo is of the three models that I have competed with this year .

PLA is fine for methanol and nitromethane, just drain the tank down at the end of the day. We have won a lot of competitions in RC pylon racing in England with 3D printed fuel tanks, yes you have to be slightly more careful but in the case of this model/engine combination the freedom of design...