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View Full Version : DeVlieg Microbore experience?



TGTool
05-27-2010, 12:21 AM
I just happened onto a bunch of DeVlieg microbore cartridges at a swap meet. I've seen them in pictures on boring tools but never in the flesh. Clever little things. Not a lot of adjustment, but carbide inserts and size adjustable from the front. They look like things I could incorporate into a boring bar of my own.

Anybody have experience using them and hints or comments?

TGTool
05-28-2010, 12:53 AM
Finally some pictures showing why these got my attention. This is the boring tool, made for three cartridges and simultaneously doing three diameters or perhaps two diamters and a chamfer. It came with a cutter in only the rear most position.

http://i48.photobucket.com/albums/f244/TGTool/P1010301.jpg

... and the components of the cartridge.

http://i48.photobucket.com/albums/f244/TGTool/P1010297.jpg

The cartridge consists of the threaded body itself with brazed carbide tip, threaded and graduated collar and rear retaining washer and screw. The tool body has just a bored hole, chamfer for the washer, two keyways and a rear counterbore for the retaining screw.

This shows the collar with tapered seat and keyed cartridge body a little better.

http://i48.photobucket.com/albums/f244/TGTool/P1010299.jpg

All the cartridges in the batch I got are 3/16", 1/4" or 5/16" though they apparently are made in various larger sizes.

http://i48.photobucket.com/albums/f244/TGTool/P1010304.jpg

All use 40 tpi until they get over half and inch or so when they switch to 20. My lookup of current suppliers points out that cartridges can be installed in either square or angle pockets but the angle pockets use a different collar. The one collar I got is graduated in 40 divisions so it's obviously for the angled pocket, not the one it was installed in though it would make no difference for cutting other than tool angle.

The 40 tpi and 50 graduations would be direct reading for diameter change so the 40 divisions must be installed at 41.4 degrees to get a direct reading to come out right. Clever thought.

They don't have a lot of movement range, but one could be installed in a larger part for coarse positioning and using the cartridge adjustment for final sizing. All wishful thinking until I see if I can get the right cavity and keyways made. I just did a job with a between-centers bar that could have used a little better size control (and a larger bar).

Boot
05-28-2010, 10:28 AM
Finally some pictures showing why these got my attention. This is the boring tool, made for three cartridges and simultaneously doing three diameters or perhaps two diamters and a chamfer. It came with a cutter in only the rear most position.

http://i48.photobucket.com/albums/f244/TGTool/P1010301.jpg

... and the components of the cartridge.

http://i48.photobucket.com/albums/f244/TGTool/P1010297.jpg

The cartridge consists of the threaded body itself with brazed carbide tip, threaded and graduated collar and rear retaining washer and screw. The tool body has just a bored hole, chamfer for the washer, two keyways and a rear counterbore for the retaining screw.

This shows the collar with tapered seat and keyed cartridge body a little better.

http://i48.photobucket.com/albums/f244/TGTool/P1010299.jpg

All the cartridges in the batch I got are 3/16", 1/4" or 5/16" though they apparently are made in various larger sizes.

http://i48.photobucket.com/albums/f244/TGTool/P1010304.jpg

All use 40 tpi until they get over half and inch or so when they switch to 20. My lookup of current suppliers points out that cartridges can be installed in either square or angle pockets but the angle pockets use a different collar. The one collar I got is graduated in 40 divisions so it's obviously for the angled pocket, not the one it was installed in though it would make no difference for cutting other than tool angle.

The 40 tpi and 50 graduations would be direct reading for diameter change so the 40 divisions must be installed at 41.4 degrees to get a direct reading to come out right. Clever thought.

They don't have a lot of movement range, but one could be installed in a larger part for coarse positioning and using the cartridge adjustment for final sizing. All wishful thinking until I see if I can get the right cavity and keyways made. I just did a job with a between-centers bar that could have used a little better size control (and a larger bar).

I used these 15 yrs. ago in a Jig Bore. They worked great producing parts for centrifuges and sewage treatment plants. They also come with lock washers and locknut to keep the size you got on you last part for the next part. We used to use one boring bar to do a couple bores in a part. The micrometer adjustment works real nice when sneaking up on a finish size. we did press fits for bearings and sleeves with them. Once you reach your size you could put the lw and l nut on to hold that size for the next bore. We even had the cartridges that held replaceable inserts . No need to resharpen carbide just replace an insert. Also cut counterbores with a slab style cartridges in same holders. They fit in boring bars and boring rings.