Member postings for Michael Gilligan

Yes

... It's rather like driving on the Left or the Right side of the road.

... Two choices, each equally valid

But it does sometimes help to know which convention has been adopted.

MichaelG.

P.S. There is a remarkably thorough page on Wikipedia.

Edited By Michael Gilligan on 19/09/2012 08:58:38

Nigel,

I think there was something by Duplex, in Model Engineer ... many years ago.

... any offers from our Index experts?

MichaelG.

It may be worth talking to Sutton Tools [website here]

They have an excellent showroom, opposite the Jewellery School on Vittoria Street, Birmingham.

MichaelG.

.

P.S.

If you do go to Birmingham Jewellery Quarter; find time to visit this amazing Museum.

Edited By Michael Gilligan on 19/09/2012 08:08:43

Neil,

This might be useful as a "benchmark" for power handling:

I recently bought [secondhand] a cheap'n'cheerful woodturning lathe

Record DML/24 ... with 3-step Poly-Vee drive

This has a 1425rpm induction motor [1/3 HP, I think] and a top speed of about 2000rpm.

... the drive belt has only four ribs, and is marked 180 J4

Seems perfectly adequate for the job.

MichaelG.

Dave,

That video is brilliant

Thank You

MichaelG.

Jason,

This does seem to have got rather out of hand, doesn't it.

My second note to Wolfie last night was a genuine question.

MichaelG.

Fred ... that's much easier name.

O.K. that sounds like a good plan.

It would be worth looking at the components available from Marchant Dice.

[they also trade on ebay, so you might find a bargain]

Provided that you keep a realistic balance between the "weight" of the machine, and the loads you expect to put on it; the only real problem will keeping the dust and swarf out of the linear bearings.

Good luck ... and please keep us informed of progress.

MichaelG.

That would be the one, Jason

Edited By Michael Gilligan on 18/09/2012 08:09:52

Welcome aboard, ntambomvu

Not specifically ... but they do work very nicely on microscope stages and such.

The steady load capacity can be astonishingly high, but I suspect you may have problems [bearing tracks pitting] caused by vibrations that are transmitted from the cutter. It really depends what sort of work you are expecting the machine to do.

... A heavily built machine, taking light cuts, could be fine.

What do you have in mind?

MichaelG.

Edited By Michael Gilligan on 17/09/2012 21:51:34

So what's the problem ?

MichaelG.

Neil,

I have not used them as a supplier, but Beeline looks promising.

and these guys list price per rib.

MichaelG.

Edited By Michael Gilligan on 17/09/2012 20:38:48

Wolfie,

I see that you are still struggling with this, so please allow me one more try:

In the diagram; the "side view" is the stable point of reference ... it's the position of the two concentric circles that varies. [ Yes, I know that sounds pedandtic, but it's important to understanding the diagram.]

The "object" is a solid truncated cone and is therefore radially symmetrical ... it is a solid of rotation, just like you would turn in the lathe. Any "side view" is therefore identical, so the trapezoid shape is infinitely ambiguous. [we neither know, nor care, if it is side, top, or bottom]

The end view [regardless of which projection we use], is two concentric circles both drawn in "solid line". We MUST therefore be looking at the small end of the object.

The only thing that remains is the location of that end view ... and that is the crucial piece of information that is provided the diagram. It defines the format for all views in the drawing.

MichaelG.

Thats definitely the expedient solution for a one-off, Jason.

MichaelG.

Wolfie,

The graphic on p38 shows:

First Angle ... Object inside the corner of a box with [let's say] cardboard walls

Third Angle ... Object inside the corner of a box with [let's say] tracing paper walls

In photographic terms it would be the difference between using "Front-Projection" and "Back-Projection" screens.

Does that help?

MichaelG.

At last ... I have found this properly presented explanation of Orthographic Projection ... theme and variations.

[Wolfie, and others] this is highly recommended reading.

MichaelG.

If the graphic on p38 doesn't clarify the difference between First and Third Angle Projections, then nothing will.

Edited By Michael Gilligan on 17/09/2012 08:46:29

Sverre,

Thanks for re-posting those links

The design looks very promising; and that write-up about building it is exemplary.

Definitely one to remember !!

MichaelG.

Just found this thread, about an X2 conversion.

MichaelG.

I have NO experience of the X2 Mill but, for what it's worth:

I would look very seriously at PolyVee belts. They handle amazing torque, and wide ratios ... they absorb very little power and can run fast.

What more do you need?

Oh yes! ... The pulleys are a doddle to make.

MichaelG.

Lots of info here

Edited By Michael Gilligan on 16/09/2012 21:46:45

I think your attitude has hardened since 2011

MichaelG.

Andrew,

I don't know if this helps but ... any end-mill or slot-drill with a concave underside is, in extremis, effectively just a multi-tipped flycutter.

Your penultimate comment is therefore highly relevant; and a FLAT barrel shape is the special case that is exactly on the tipping point between concave and convex.

MichaelG.