Timesaver lapping abrasive

Great stuff, Timesaver lapping abrasive. "Guaranteed not to continue to cut". This week I had two instances to use it. The first was when I tried to thread new nuts onto the shaft of an old (probably 1940s vintage) Baldor grinder. The new nuts would not fit. I measured the pitch diameter of the 1/2-13 threads and they were oversize. The nuts that came with the ancient grinder were larger than normal 1/2-13 across the flats. .937 while normal 1/2-13 nuts are .750 across the flats. The nut threads were also quite oversized because the fit was quite loose on the grinder shaft. So I mixed some of the Timesaver stuff with a little oil and lapped the new nuts to the threads. Only took about 15 minutes to get a nice fit. Then today working on a DoAll vertical bandsaw that had been converted from a band filer I ran into a problem. The bar that holds the blade guides and slides up and down would not slide easily. The guide for it, when bolted tight to the saw, would warp slightly. So I used the same stuff I mixed earlier and lapped the pieces together. Now the bar slides easily and smoothly without being sloppy. I love the Timesaver Lapping abrasives. They don't imbed, break down fast into a finer abrasive, and eventually stop cutting. Good stuff Maynard. Eric

Reply to
etpm
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I see it for $50 per pound on Ebay. Where do you get it?

Paul

Reply to
Paul Drahn

Greetings Paul, It's made by Micro Surface Corp. in San Jose, CA. I bought the 8ea. 3 oz. can kit from Newman Tools. Here's a link:

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The test kit is $208.00, which seems high but I bought my kit over a decade ago, have used it many times and still have most of the stuff left. It doesn't take much to lap stuff in and it has saved me tons of money over the years because it gets used in my business. Eric

Reply to
etpm

It looks like McMaster carries it too:

1 lb. 5lb.

Available Grits Each Each For Soft Metals

80, 120, 220, 320 4781A4 $26.79 4781A5 $118.10 For Hard Metals 40, 80, 220, 320 4781A6 $26.79 4781A7 $118.10

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Reply to
Leon Fisk

$9.00 for a 3-oz. jar from Micro Surface. Here's the Yellow grade. The othe rs should be selectable from the choices on the webpage.

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e-and-aluminum/

IIRC, it's mostly silica or glass, at least for the hard (green) version ma de for ferrous metals. If you remember engine valve lapping compounds from

50 or more years ago, they were ground glass for the same reason. It resist s embedding in cast iron valve seats.
Reply to
edhuntress2

Or try

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$3.66/10g, because who needs a full pound of lapping powder?

Reply to
Larry Jaques

"Larry Jaques" wrote in message news: snipped-for-privacy@4ax.com...

I've often wondered how this lapping powder would work on say, a '66 GM 225 V-6 crankshaft. Use it to fine tune the clearances all at once. Solvent clean ofterward. Anyone try this? ;>) phil k.

Reply to
Phil Kangas

Wouldn't the abrasive just get embedded in the insert? That's not good... sorry i posted the question. phil k.

Reply to
Phil Kangas

Greetings Phil, The yellow label stuff is for lapping soft metals in just the kind of application you describe. I have lapped in many babbit bearings using Timsaver lapping compound. Mix the stuff with oil according to the instructions and apply through oil hole if the bearing has one or apply to bearing shells and assemble the bearing. The abrasive will not embed into the soft metal but will instead lap it. Conventional lapping compound, like the Clover stuff, will embed in the softer metal and lap the harder metal. Timesaver works opposite in that it will not embed and will lap the softer metal. Eric

Reply to
etpm

Ok, that's good to know. Thanks for the input, eih? ;>)

Reply to
Phil Kangas

Greetings Ed, When I bought my 8 can sample kit years ago I bought it directly from Micro Surface but had forgotten their name. When I looked for it online the other day Newman Tool was the first link. I had no idea they would mark up the same kit more than 200% over what Micro Surface charges. I'm glad you looked more and found that much cheaper price. The fact that it doesn't embed and laps the softer metal is quite useful in certain situations and I'm sure there are folks reading this group that could use it, especially at the much cheaper price you linked to. Thanks, Eric

Reply to
etpm

thers should be selectable from the choices on the webpage.

onze-and-aluminum/

made for ferrous metals. If you remember engine valve lapping compounds fr om 50 or more years ago, they were ground glass for the same reason. It res ists embedding in cast iron valve seats.

I'm glad you brought it up, Eric. I've heard of it and I was curious, but I never checked it out before.

I remember reading an article about building benchrest rifles, and the auth or recommended it for lapping-in the lugs on a bolt action. That was the ha rd version, made for lapping steel.

From one of the MSDSes online, I see that the steel version also contains g arnet. That's another silicate, usually aluminum silicate, which is a good abrasive but it has two properties that sound right in line with the idea o f not embedding: it fractures easily, and it doesn't cleave into strong cry stal shapes. It just keeps breaking up.

So maybe I'll find a use for it. I used to do a lot of lapping, when I spen t a lot more time in the shop. I avoid using a toolpost grinder when I can, because I don't want that grit on my lathe bed.

Reply to
edhuntress2

We have 48 days before you pull that one, Phil. But, by all means, try that one on your own engine. ;)

Reply to
Larry Jaques

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