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The basic problem is the design of the carriage!? The vertical play is adjusted with clamp & jack screws vaguely locating the clamp strips on the underside of the bed; that's common on larger lathes,

I made something similar for one particular application and find I use it quite a bit for general turning. Mark

I have made 2 new and longer pressboards under the saddle in both x directions. They have also contact on outside to saddle. 2 of the 3 fasten screws on the front are now available from upper side for

That could be related to play in the saddle gibs. [email protected]> wrote:

Has somebody made a lead screw to be installed in the middle of the bed ? I have looked into Youtube, but not found what I wanted. The problem is twisting of the saddle when I return the clock wheel

TERMS OF USE -- How the 7x12 Group Operates The 7x12 Minilathe forum was founded as a way for machinists, both expert and novice, to help each other learn about our machines and to inspire each other

Drilling a 486 CPU is like drilling glass, the 486 is probably harder. Same technique would be needed, diamond drill, water, patience etc. Here’s an old page for making a keychain from a 486,

It also reduces the heat generated in the tooth and washes away the swarf from the operation. Ultrasonic drills also use a mist spray for these same reasons (but they don’t utilize diamonds bonded

Diamond abrasive bits are actually diamond powder mechanically attached, not chemically bonded, to the bit body with nickel plating. When your dentist uses them, notice there's always a cooling water

HEURELA? ?TONY JUST? WELDING? SOME? HOICK AND? THAT? IT? THANK JACK 47 71

Depends on the age on the CPU. Most CPUs up to the first Pentiums were all ceramic – have fun drilling thru that. Later ones shrunk the ceramic bit and have a “moat” of maybe 5-15mm of

maybe a 44 mag animal

I thought the hole was to be through the circuit board, not the chip itself.? The substrate is silicon which is rather hard.? It has a Mohs hardness of about 7.? Titanium is less hard at 5 to 6 as

Perforate the chip with a LASER! ?in a CNC to run a circle pattern round-and-round to achieve the desired hole size.

Keychain or similar I guess, maybe drawer pulls for a nerd cabinet. Never tried drilling one, but yeah diamond would be the go. Maybe masonry or glass bits. It’s a pretty common craft item.

1) I am curious as to why you want to drill a hole through a scrap 486 microprocessor. 2) The substrate for the microprocessor is very likely some type of ceramic material, so it is expected to be

I don't think we are talking Cu/FR4 PCB drilling here, rather drilling through a ceramic microprocessor package.

I started with a .6 to 1.5mm set and then bought 10 pack replacements for some I did break, all from eBay.? I was drilling lots of small holes and was dulling them before I broke too many.? They

There are also re-sharpened ones that are even cheaper. Unfortunately, one of the batches I bought were packaged with a piece of? plastic foam with the drills stuck into it, quite a few of them broke

Yes, try the carbide PCB drills. They're sharp and hard and will cut stuff that just laughs at high speed steel or even cobalt drills. BUT they are fragile and will break if you look at them sideways.