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Tuesday, November 24, 2009

Diamond Segments

Diamond impregnated segments are used on core drills that cut concrete slabs. I got a 12" diameter core drill in last week missing two segments. Cylindrical .230"Φ x .930"L, stainless steel with diamonds embedded throughout.  My initial thrust was to melt some stainless and stir in a few diamonds. Sun Diamonds of Berkeley, CA sent over 20 grams of their 30 mesh man made diamonds. Unfortunately, molten stainless steel does not wet the diamond. They pop out like corks and sit on top. Ah! But certainly one might simply layer a few stones with stainless sheet and hammer the billet into one's desired shape. Nope. Old Man Oxidation throws a wet blanket on that party preventing a good welding of the layers. Well, it looks like a job for sintering. I made good use of a few hours and ran the auto filer over a sheet of 420 SS. With 5 grams of SS powder, I ratioed the diamonds in 1:3 by volume. This makes the diamond 25% by volume, and 12% by weight. Twenty Five percent by volume is considered as "100%" in the industry. You can't really put any more in or it won't hold together. I selected a 1/8" 316 SS 4" nipple set vertically in a 316 SS ninety. Off to one side ran another nipple which accepts an argon purge. I drop a length of 17/64" drill stock down the hatch, pour in about 5 grams of my "Diamond-'n'-Steel" mix and set another piece of drill stock into the top. Tap. Tap. Tap. Turn on the purge - .5 lpm, bring out a number three oxy torch tip at full blast. When the area containing the powder is yellow hot, give it a few more firm taps with a large ball peen hammer. Let cool while purging. Inside I found the lower third unsintered, above that a huge hole then an area where some sintering had occurred against the wall of the tube. I melted the mess into a pliable mass, but it went liquid and expelled the diamonds. Coming up next: Plan B

24 nov 09 @ 7:09 pm est          Comments

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Bill Slugg - Owner/Operator 
Fred's Sharpening Shop
1820 Ledo Road
Albany, GA 31707
M-F 9:30AM until 6PM
Mower blades - $2 off the mower. 
Saw chain on the saw - $5 
Saw chain off the saw - $3
Note: Saw chains must come off the saw because they have to go on to a machine in order to be sharpened.  
Loppers - $5
Hedge shears - $5
Gas or electric Power hedge trimmers - $10
Carbide circular saws - $.20 per tooth - simple alternate top bevel (Most saws)
Carbide circular saws - $.30 per tooth - triple chip or other advanced tooth form
Planer blades - $.50 per inch of ground edge
Chipper blades - $1 per inch of ground edge
Drill bits - $.50 to $1 for 1/8" to 3/4".

I can do spiral drill bits from .006" up to 3".
Mueller Shell Cutter Re-toothing

Shell cutters for hot tapping water/gas/steam lines - Why send them (12") off to Mueller to have them rebuilt for $1600 when I will do it for $800? Call me for instructions. 

I can straighten horizontal boring pipe. I will get the bend down to <1/8" for $20 apiece.

A few things I cannot do:
Electric hair clippers - Send entire machine back to the manufacturer or to someone on the net who advertises the ability to sharpen them AND wants to see the entire machine. Many cutting problems are due to springs, linkages, pivots, clamps, tension, etc.
Spiral tooth forms such as end mills - no plans to handle these.


I take Visa, MC, Amex, Discover, IOU's. I will bill you. I will take things in trade.

You can drop stuff off in the door slot. I have hiding places you can pick stuff up.


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