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Chip formation.

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mattinker:

--- Quote from: Meldonmech on October 29, 2013, 12:33:07 PM ---Hi
         Very interesting video presentation, now you have digested the basic theory of metal cutting tools, I feel it is important   for you to carry out some experiments for yourself and record your results. A repeat of the experiments in the video would be a good start.  Next I would suggest you try similar experiments on brass and aluminium, using the designated cutting speeds and cutting tool angles from engineering tables. This is not too lengthy a task and will provide you with invaluable experience, and records that you can refer to in the future.  At a later date you could introduce other variables like feed rate and depth of cut, recording the surface finish. The Theory of Cutting Tools is a vast and deep subject, but if you need information regarding uncommon materials for Model Engineers, it can be found on the internet, just Google your requirements.
                     
                                                          Good  Luck        Cheers David

--- End quote ---

David,

I realise that I didn't thank you for your suggestions and good wishes. My reply was inadequate. I had a bad day!

regards, Matthew

modeldozer:
Very informative, thank you for sharing.

Abraham

mattinker:
Abraham,

i'm glad it's useful, I've been seeing "chips" in a new light, as a consequence I'm getting better finishes and more precission.

Regards, Matthew

S. Heslop:
I was just drilling some big holes on the drill press today when I remembered this vid. I noticed the chips had stopped being the nice curly sort and became the ugly wobbly ones as the drill I was using got bigger. So that prompted me to reduce the speed to get the nice ones back.

I've always had trouble with grabbing when drilling steel on the drill press but I had no problems at all going by the chips. Well, until I got to about over 16mm diameter when I couldn't slow the thing down any more.

But yeah that's a good video, thanks for posting it.

mattinker:
I'm glad you liked it!

That's an interesting application of the gleaned information! Pillar drills have a tendency to be too fast. A solution to the speed problem can be to add a jack shaft.
http://forum.ih8mud.com/merchandise-storefront/617689-rogue-drill-press-reduction-kit-1-2-1-4-ratios-available.html
I couldn't find the fifties article I was looking for, but a big washing machine pulley on a jack shaft might be an interesting project.

Regards, Matthew

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