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Member postings for Pete Jones

Here is a list of all the postings Pete Jones has made in our forums. Click on a thread name to jump to the thread.

Thread: Machinable Ceramics
19/04/2011 17:38:58
Hi John, Thanks.
The 'knurl' was machined on my Boxford shaper using a small rotary table tilted at a carefully calculated angle and a 90° vee shaped lathe tool. A bit of a faff but I like the result.
Here's a link to a short wobbly video of the engine running.
Sorry gents for straying off-topic..!
Pete
 
Thread: Change gears for my lathe
09/10/2010 14:52:49
Hi Peter,
 
A few simple measurements will tell you what's what.
The O.D. of the gear should be the number of teeth multiplied by the module (this gives the P.C.D.) then add 2x the module.
E.g. 61 x 1.5 = 91.5,  + 2 x 1.5 = 94.5 O.D.
It shouldn't be possible to mesh gears of different modules although you might get away with it if they were only a few percent apart.
 
Hope this helps.
Pete.

Thread: Eagle Surface Grinder
08/10/2010 10:28:30
There's a small photo of an Eagle 5W (the wet version) on the inside back cover of ME 4360 (11th Sept 2009) in the Home and Workshop Machinery ad. Although small it does seem to show the main differences. I would have thought the biggest issue would be coolant filtration prior to recirculation.
Pete.
Thread: Machinable Ceramics
08/10/2010 09:16:03
Hi Andrew,
I was also looking at using Macor for plug insulators - very expensive stuff! Then I read somewhere that Corian (kitchen worktop material - 1/3 acrylic polymer, 2/3 aluminium trihydrate) was also a good insulator material unless you're making plugs for a high performance engine - clearly not a problem on a hit-and-miss. I managed to get half a dozen 2"x5"x1/2" off-cuts from an eBay trader (apparently, it's a popular handle material with knife makers) for a fiver and set about making some M5 plugs for my 2cc 4-stroke. It's quite easy to machine with ordinary HSS tools but it does wear the sharp edge off quite quickly so regular stonings are required. Had a few mishaps along the way - too heavy a cut with a worn tool - which would have been very costly in Macor!
Have (hopefully) attached some photos of the finished article. It's been run for about an hour now at up to 11,400 rpm and seems to be holding up well.
Best regards,
Pete





 
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