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Re: Parting Off
Once I parted aluminium successfuly, like a piece of butter, since then I have had to use a hack saw for aluminium or steel. On Thu, Apr 24, 2025, 10:56 PM Mike W via <mike.wilkens=[email protected]> wrote:
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Parting Off
Yesterday I had to part off some aluminum (6061), 24mm diameter, and remembered that I had had endless trouble previously with this operation - regardless of material.
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So this time I took off the quick change toolpost and re-installed the original four-way.? The parting off process went smoothly with none of the problems I'd encountered before.? It did get jammed once - I was running the motor too slowly.? (I don't have a low gear anymore.)? Didn't matter if I used oil or not, or went fast or slow.? It was as easy as any other operation.
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Something about how the QC extends over the compound - one of the weak parts of these lathes - lessens the rigidity necessary to do this operation well.
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-Mike
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Re: New Lead Screw Bearings And Installing A Mystery Rod
I dunno what's up with that hex rod but I did something similar to address backlash in the lead screw.? I didn't use angular contact bearings, I used thrust bearings.? I did it by machining a replacement bearing? block, which has the same outside dimensions as the OEM version.? I saw no point in using steel so it's 6061 aluminum.
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The job was done to improve the performance of my LS hand crank mod.? My LS is 16TPI so the Z motion is a little coarse compared to the cross slide and compound feed screws @20TPI.? I also added a DRO on the Z axis so it can function as a long-throw compound.....for some things.? I still need the top slide for threading so it's not going in the scrap bin.? But for a lot of stuff I can use the plinth, which is good in terms of improved rigidity.
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Mark |
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Re: New Lead Screw Bearings And Installing A Mystery Rod
OK, that works. Yes, I Have seen this. That guy does some fabulous stuff. I have been subscribed for quite a while.
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Thanks. Sent from ProtonMail, Swiss-based encrypted email. Sent with Proton Mail secure email. On Monday, April 21st, 2025 at 11:54 PM, mike allen via groups.io <animal@...> wrote:
It's not you , it's me . that means that I sent a machining link to |
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Re: New Lead Screw Bearings And Installing A Mystery Rod
It's not you , it's me . that means that I sent a machining link to
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a bunch of buds instead of the music link I thought I was sending . try this For some unknown reason I have been unable to post comments on youtube now for a couple of years & I also no longer have the button to hit to send the video to my TV . sorry bout the link animal On 4/21/25 11:49 PM, Phil via groups.io wrote:
Is it just me? |
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Re: New Lead Screw Bearings And Installing A Mystery Rod
Is it just me?
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I'm not seeing any kind of link. Youtube or something? Sent from ProtonMail, Swiss-based encrypted email. Sent with Proton Mail secure email. On Monday, April 21st, 2025 at 11:45 PM, mike allen via groups.io <animal@...> wrote:
I just kinda tripped over this earlier tonite figured there may be some |
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Re: Lead screw
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, doesn't scale down well for 7x? lathes. The fix is to replace the screw adjustment system with shims & have the clamp screws tight. It can get a little tedious if the underside of the bed is uneven, requiring some work with? curved files, "rifflers."
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Roy |
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Re: Lead screw
开云体育
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 better control of the press.
Back side is no problem.
My lead screw is now manual operated.
(Much better than the big Hand wheel in front)
Johannes
Mexico
From: [email protected] <[email protected]> on behalf of mario mohl via groups.io <mario.mohl@...>
Sent: Monday, April 7, 2025 19:18 To: [email protected] <[email protected]> Subject: Re: [7x12MiniLathe] Lead screw ?
That could be related to play in the saddle gibs.
On Mon, Apr 7, 2025 at 8:02?PM Johannes via <johannes=[email protected]> wrote:
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Re: Lead screw
That could be related to play in the saddle gibs. On Mon, Apr 7, 2025 at 8:02?PM Johannes via <johannes=[email protected]> wrote:
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Lead screw
开云体育
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 cutter.
( 144 teeth on an 88 mm diameter plate gives not much room for error)
The leadscrew shall be manual twisted.
Johannes
Mexico
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Re: dril a scp 486
开云体育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, basically solder a wire to the back.? ? https://web.archive.org/web/20010410093643/http://www2.apex.net/users/timwhita/keychain.html ? Not sure why they took a Dremel to the pins, you can unsolder those.? Note that the metal plate on the back of the chip is soldered on, unsolder that and fill it with resin so you can see the actual CPU. ? Tony ? ? ? From: [email protected] <[email protected]> On Behalf Of Jacques Savard via groups.io
Sent: Sunday, 23 March 2025 5:28 am To: [email protected] Subject: [7x12MiniLathe] dril a scp 486 ? 399?/?5?000 ? Résultats de traductionRésultat de traductionI have some cpu 486 or pentium vintage version ? But impossible to drill a ho;e in the material Normal drill for Metll Nothing barely trace Probably epoxy Do you have an idea please |
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Re: dril a scp 486
开云体育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 on the “bit”. ? Jerry F. ? From: [email protected] [mailto:[email protected]] On Behalf Of Roy via groups.io
Sent: Sunday, March 23, 2025 4:33 PM To: [email protected] Subject: Re: [7x12MiniLathe] dril a scp 486 ? 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 mist involved to protect the integrity of the bit. ? Roy |
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Re: dril a scp 486
开云体育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 PCB that you can more easily drill thru.? These are the ones that tend to be made into keyrings. ? Modern CPUs drop the ceramic cover and instead have a metal cover over the entire chip, you can drill the edge of those. ? Depending on usage might be easier soldering a plate to the back of the chip. ? Tony ? From: [email protected] <[email protected]> On Behalf Of Charles Kinzer via groups.io
Sent: Sunday, 23 March 2025 3:31 pm To: [email protected] Subject: Re: [7x12MiniLathe] dril a scp 486 ? 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 a comparison.? Tungsten carbide 9.? The silicon wafer is also much harder than regular glass. ? You probably not only need something like a diamond drill as mentioned, but perhaps even a means to cool it. ? One other thing.? The silicon wafer at the beginning of the semiconductor manufacturing process is about 1 mm thick.? Many wafers, after the devices have been deposited on them, go through a "backgrinding" process to remove much of the silicon wafer to make it thinner.? Then it is sliced up into individual chips and then packaged.? Thinning helps with heat distribution.? (I know this stuff because I was involved in designing semiconducting manufacturing equipment).? Therefore, the substrate might actually be quite thin. ? Charles E. "Chuck" Kinzer ? ? ? On Saturday, March 22, 2025 at 09:15:44 PM PDT, Jon Rus via groups.io <byghtn5@...> wrote: ? ? Perforate the chip with a LASER! ? ?in a CNC to run a circle pattern round-and-round to achieve the desired hole size. ? ? ? ? ? ? ? ? On 3/22/2025 2:27 PM, Jacques Savard via groups.io wrote: 399?/?5?000 ? Résultats de traductionRésultat de traductionI have some cpu 486 or pentium vintage version ? But impossible to drill a ho;e in the material Normal drill for Metll Nothing Drill Diamand for glass or stained glass Nothing barely trace Probably epoxy tre Do you have an idea please Jack 47 71 it is exposy proly but very hard stouf Any Advise Please ? |
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Re: dril a scp 486
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Re: dril a scp 486
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 a comparison.? Tungsten carbide 9.? The silicon wafer is also much harder than regular glass. You probably not only need something like a diamond drill as mentioned, but perhaps even a means to cool it. One other thing.? The silicon wafer at the beginning of the semiconductor manufacturing process is about 1 mm thick.? Many wafers, after the devices have been deposited on them, go through a "backgrinding" process to remove much of the silicon wafer to make it thinner.? Then it is sliced up into individual chips and then packaged.? Thinning helps with heat distribution.? (I know this stuff because I was involved in designing semiconducting manufacturing equipment).? Therefore, the substrate might actually be quite thin. Charles E. "Chuck" Kinzer
On Saturday, March 22, 2025 at 09:15:44 PM PDT, Jon Rus via groups.io <byghtn5@...> wrote:
Perforate the chip with a LASER!
?in a CNC to run a circle pattern
round-and-round to achieve the desired hole size.
On 3/22/2025 2:27 PM, Jacques Savard
via groups.io wrote:
399?/?5?000
?
Résultats de traductionRésultat de traductionI have some cpu 486 or pentium vintage version
?
But impossible to drill a ho;e in the material
Normal drill for Metll Nothing
Drill Diamand for glass or stained glass Nothing
barely trace
Probably epoxy
tre
Do you have an idea please
Jack 47 71
it is exposy proly but very hard stouf
Any Advise Please
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Re: dril a scp 486
开云体育Perforate the chip with a LASER!
?in a CNC to run a circle pattern
round-and-round to achieve the desired hole size.
On 3/22/2025 2:27 PM, Jacques Savard
via groups.io wrote:
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Johannes