might make a clock

**SawDustSniffer** · 4th March 2012, 12:55 PM

i found some free download CAD files of wooden clocks on a site called GrabCAD
LINK>Results for

i own a cnc machine and was thinking the first try at a clock would be made out of aluminium sheet 3mm thick

the design i was going to base mine on is from http://www.woodenclocks.co.uk/Clock%...ch-PR-iss2.PDF

a wall mount pocket watch look

with the aluminium i was planing on adding some details to the cogs to make it a bit fancy and found a "hindo" image about time , to engrave (second image )

My CAD has auto cog draw so will properly use them , you just define the tooth shape , and how many teeth and hit return and the cog is there (pic3)

**SawDustSniffer** · 7th March 2012, 05:09 PM

the joy of cutting 3mm thick aluminium with a 2mm end mill , its so slow ,
yer they say run flat out with aluminium ??? any thing more than creeping will brake the bit

**petersemple** · 7th March 2012, 05:31 PM

I saw the links you posted, and will probably choose one to make too - but I will be doinf wood, and using a scroll saw to cut out all the cogs. Reckon I'll be at for a while. I bought the scroll saw due to an interest in clocks though, and don't really have access to a shed, so Most of my tools are locked away. The scroll saw is pretty partable though so I can take it out and put it away. Perfect time to start in on a clock.

**SawDustSniffer** · 7th March 2012, 06:22 PM

glad some one could use the posts ,
i was looking for some plans for my self so i posted what i found ,
lol it might be way quicker to cut them on a scroll saw , the 2mm bit on a cnc breaks way too easy , so you have to slow it right down ,
but then again , it gives me time to clean out the shed while its cutting , the time it takes dosnt really matter because you can do other things ( with in running distance to shut it down )

im using aluminium because of the humidity up here in darwin , cant see a timber cog staying stable up here, oh , and because i had a 400mmx1200 sheet of 3mm aluminium

**petersemple** · 7th March 2012, 07:38 PM

I saw a wooden one working years ago, and wanted one ever since. Not sure yet what I'll do about stability. Some people seem to bake each cog out of several wedges of timber with the grain aligned. I have seen others make a plywood out of randomly arranged veneers.

**SawDustSniffer** · 11th March 2012, 02:20 PM

started on the cogs , with the time it takes to cut these i gave up on the idea of giving them a 3d texture (and my grey scale to 3d program is crap)

the plans i bought are not to scale !!!! so each cog has to be scaled before CAM , and the "put together" drawing is a bit lacking as well , what do you expect for $15 , each part is well defined with dimensions

2mm HSS endmill , 0.2mm per pass , 40mm/min speed , 18,000RPM on 3mm aluminium sheet , i used synthetic 2 stroke oil as coolant , ive ran a file around the cogs to remove the sharp edges

ordered some small bearings with a flange to mount these on

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