Re: WOT (Waay off topic): circular saw blade not cutting anymore (gets stuck on material)
In message <D3854F6E-68F9-4D6F-99AE-3E672C02A54E@...>, benx618(g) <benx618@...> writes WOT OT FYI
Radu forging new ground re English language:
WOT is traditionally a common motor-head term likely dating back to at least the
1930¡¯s hot rod era.
Meaning = Wide Open Throttle = Full Throttle. Still in common use in the
vehicular/motor world. Flat out?....
Ben
-- Tony Sayer
|
Re: WOT (Waay off topic): circular saw blade not cutting anymore (gets stuck on material)
On Sunday 01 September 2024 10:25:25 am Harvey White wrote: If you want to trim connectors, then the mill might be a good idea.?
Some of the Harbor Fright mills are good, I have a Grizzly, and can talk
to you about it. Which one did you get? I've been thinking about getting a mill for a good long time, but haven't pulled the trigger on one yet... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin
|
Re: 8566B Can't Calibrate
At 70dB, I'm seeing just massive noise.
At 60dB, occasional noise fickers
At 50dB, I see a thick, fuzzy arch
At 40dB, I see a less fuzzy arch
At 30dB, I see a nice, clean arch
At 20dB, I see a nice clean arch of almost the same amplitude as with 30dB.
At 10dB, I see nothing
At 0dB, I again see nothing.
?
I think that test idea was a good one. So the attenuator is screwed?
|
Re: WOT (Waay off topic): circular saw blade not cutting anymore (gets stuck on material)
Wait, of?course!... (forehead slap audible west of the Rockies...) Quite a brain fart to say "occasionally cut? PCB and wasn't aware there's an ominous aspect to it." I did/do, just tucked it away in obsolete sectors of the brain, as it's been many years since I stopped prototyping/fabbing my own boards (as opposed to designing and having them fabbed by some house), and so cutting PCB has not been a thing for me in a very long time.?
Anyway, I very much like the idea of using shears (will need to figure their size and what would make them cut distinguishably straight - I'm unfortunately extremely anal with such things - as the boards I need to slice are about 6" long), and also I need to gear up on a shop vac, which I'd like to have HEPA-filtered.?
Thanks a ton all. Radu.?
On 9/1/24 06:56, Radu Bogdan Dicher wrote:
> PCB sawing dust? If yes, I'm not cutting PCB in this particular step under examination here - but rather plastic (fiberglass?...)
> from the edge connector body - though I've occasionally cut PCB and wasn't aware there's an ominous aspect to it. John - would you
> care to elaborate?
Sure.? Any dust with ceramic in it fills tiny sacs in lungs leading to emphysema.? Also can be carcinogen.
Use a nice mask and ventilation when cutting.? ? ?Ventilation such as a vacuum cleaner would do.
I like the recommendations to use an abrasive diamond wheel, and also use it at low speed if possible, not on an angle grinder.
for instance, for floor and countertop polishing, diamond embedded in rubber discs is used at low speed with a spigot for water
flowing through the motor shaft, out the abrasive wheel center.? Keeps it safe.? (If the GFI works!)
--
John
|
Re: 8566B Can't Calibrate
It's RECALL 9. I see the scan going past slowly at the very bottom of the screen, but no trace at all and the Freq Zero trimmer does nothing. This looks like quite a significant issue with the dynamic range. Perhaps this analyzer has gone a bit 'deaf' through overloading the RF input in the past. :-/
|
Re: 8566B Can't Calibrate
Well, at the moment, that pot is doing precisely nothing and there's no trace visible as per the photo I posted. There *is* a 100Mhz signal going into RF input, though.
Fortunately I have a spare HP SA (can't recall the model number but it goes 9kHz to 12Ghz.) that did come in handy for the YTO issue even if its specs aren't close to those of the 8566B. Looks like it might come in handy again - at some future point when I have the time to deal in detail with this unforeseen hitch!
|
Almost free to good home, HP 3570A/3330B system + manuals and spares
Offered for pickup only, in Santa Fe, NM. A working HP 3570A and 3330B Network Analyzer system, with manuals, spare units, and interconnect/HPIB cable.
This one will cost ya all of $30.
?
?
The 3570A was my first low-freq VNA (in 1982) and so I have a soft spot for it. I repaired and calibrated the two units in 2018 and they worked fine until replaced with an Anritsu VNA.
?
Yes, the 3330B front panels are ugly, there was a paint incompatibility issue, only fixed in later production units. The working 3330B has the high voltage option.
?
Also included but not shown is an HP 3571A, complete but needs repair.
?
|
Re: WOT (Waay off topic): circular saw blade not cutting anymore (gets stuck on material)
On 9/1/24 06:56, Radu Bogdan Dicher wrote: PCB sawing dust? If yes, I'm not cutting PCB in this particular step under examination here - but rather plastic (fiberglass?...) from the edge connector body - though I've occasionally cut PCB and wasn't aware there's an ominous aspect to it. John - would you care to elaborate? Sure. Any dust with ceramic in it fills tiny sacs in lungs leading to emphysema. Also can be carcinogen. Use a nice mask and ventilation when cutting. Ventilation such as a vacuum cleaner would do. I like the recommendations to use an abrasive diamond wheel, and also use it at low speed if possible, not on an angle grinder. for instance, for floor and countertop polishing, diamond embedded in rubber discs is used at low speed with a spigot for water flowing through the motor shaft, out the abrasive wheel center. Keeps it safe. (If the GFI works!) -- John
|
Re: WOT (Waay off topic): circular saw blade not cutting anymore (gets stuck on material)
Common in general aviation, too.? Except for descent and landing, I operate WOT.
Peter
toggle quoted message
Show quoted text
On 9/1/2024 11:17 AM, benx618(g) via groups.io wrote: WOT OT FYI
Radu forging new ground re English language:
WOT is traditionally a common motor-head term likely dating back to at least the 1930¡¯s hot rod era.
Meaning = Wide Open Throttle = Full Throttle. Still in common use in the vehicular/motor world.
Ben
|
Re: WOT (Waay off topic): circular saw blade not cutting anymore (gets stuck on material)
On Sat, Aug 31, 2024 at 10:33 PM, Radu Bogdan Dicher wrote:
What dust is deadly
not sure about the glass fibers from cutting or grinding, FR4 PCB.
those small glass fibers are not supposed to be carcinogenic.
though... and in my case... that and 'fiberglass,' or 'glass wool' products caused upper respiratory track problems... at least temporarily.
?
Being exposed to the prolonged processing of cementitious products that contain crystalline silica (like some kinds of sand) can lead to silicosis or fibrosis... and impaired lung functioning... and can be deadly.
I still see crews doing dry abrasive cutting on concrete here, without protection.
Over time, those small particles get trapped in, and build up, deep in the lungs.
?
Wet cutting reduces that... and reduces heat too... but creates another kind mess as well.
Processing outdoors reduces, and shares, the hazard to most living things with lungs.
?
A NIOSH approved respirator with a P100 filter, is supposed to help trap these very small particulates. (0.3 micrometers?)
?
The 'special sauce' to enhance the deadliness, for processing all these materials...especially for creatures with lungs, is a long mixture of time and exposure.
I believe... for many of the people posting here that nature will most probably finishing them off, long before a weekend hobby will.
?
Yet... safer than sorrier.
|
Re: WOT (Waay off topic): circular saw blade not cutting anymore (gets stuck on material)
WOT OT FYI
Radu forging new ground re English language:
WOT is traditionally a common motor-head term likely dating back to at least the 1930¡¯s hot rod era.
Meaning = Wide Open Throttle = Full Throttle. Still in common use in the vehicular/motor world.
Ben
|
Re: 8566B Can't Calibrate
The FREQ cal may be off far enough that the cal signal is off screen. Do the FREQ CAL first. I don¡¯t remember which Recall # that is. It¡¯s in the manual.
It¡¯s a touchy adjustment. Small movement of the pot will cause large jumps in the signal level. The viewed signal will be a line across the screen with a sweep time of many seconds. Adjust for maximum level.
Best regards,
Bill
|
Re: 8566B Can't Calibrate
You don't give us much to work with. Try changing the inputt attenuator setting with the calibrator signal connected. Default is 10 dB. Step through the entire range, from 0 to 70 dB and see if the signal level changes. Do this while the scale is 10dB/div. To set the attenuator to 0dB, you will have to enter "0" via the number pad.
?
Vladan
|
Re: Free to good home, HP 5423A system + manuals and spares
On 9/1/24 10:47, John Griessen via groups.io wrote: I don't see that as an option in Google Photos. I think he meant groups.io.
I see your photos after logging in.
I didn't mean groups.io. He had initially put them on photos.google.com. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Re: Free to good home, HP 5423A system + manuals and spares
On 9/1/24 08:43, Precaud via groups.io wrote: I don't see that as an option in Google Photos. I think he meant groups.io. I see your photos after logging in. -- John Griessen
|
Re: Free to good home, HP 5423A system + manuals and spares
On Sun, Sep 1, 2024 at 08:23 AM, David C. Partridge wrote:
You can make the folder public
I don't see that as an option in Google Photos.
|
Re: Free to good home, HP 5423A system + manuals and spares
On 9/1/24 10:27, Precaud via groups.io wrote: Thank you. Album is ?/g/HP-Agilent-Keysight-equipment/album?id=297304 Thanks. I'll see if my friend will be passing through NM on his next trip. I don't think the chances are high, but there's a possibility at least. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
|
Added photo album HP 5423A system + manuals and spares
#photo-notice
|
Re: Free to good home, HP 5423A system + manuals and spares
Thank you. Album is ?/g/HP-Agilent-Keysight-equipment/album?id=297304
|
Re: WOT (Waay off topic): circular saw blade not cutting anymore (gets stuck on material)
If you're cutting a populated board, then router bit in a mill might do rather well, dust can be nasty (glass fibers).
if you're going to cut unpopulated board, then go pick up an inexpensive shear.
If you want to trim connectors, then the mill might be a good idea.? Some of the Harbor Fright mills are good, I have a Grizzly, and can talk to you about it.
Harvey
toggle quoted message
Show quoted text
On 9/1/2024 8:56 AM, Radu Bogdan Dicher wrote: Gabor,
Thanks for that recommendation. Really interesting, I'll investigate it. It seems there are some very affordable CNC machines on the usual marketplaces (what are the "2030" or "3040?" What brand, I guess?). Further and more detailed recommendations would be appreciated.
For PCB cutting, I was planning to use the diamond blade included with the saw. The resin blade I think would do too in a pinch.
Radu.
On Sun, Sep 1, 2024 at 2:22?AM sniper.asys via groups.io <> <sniper.asys@...> wrote:
Hey,
if it's glass fiber reinforced plastic, or you're cutting PCBs with
it, you'll need solid carbide blades in order to be able to expect a
meaningful tool life. Even better, if this happens regularly or in any
kind of volume, you'll be probably better off buying a cheap small CNC
router like a 2030 or 3040 that takes dirt cheap 1/8" carbide endmills
and router bits (corn cutters). You can set up a fixture for holding
multiple connectors on the table and be done with dozens of them at a
time.
Gabor
On Sun, Sep 1, 2024 at 7:35?AM Radu Bogdan Dicher via groups.io
<>
<vondicher@...> wrote:
>
> My apologies, Peter, not "Peeter" as my hiccuping keyboard may
have implied.
> Radu.
>
> On Sat, Aug 31, 2024 at 10:32?PM Radu Dicher
<vondicher@...> wrote:
>>
>> Thank you Peeter, Michael, John.
>> I'm currently leaning on thinking I had a couple degrees angle
of "attack" error/tilt I didn't realize the saw squaring device
creeped to have. The mirco-table saw is great overall, but doesn't
have extremely precise adjustments of the geometry of cutting. Not
100% sure that's what was causing my conundrum, but the working
theory I'm on right now.
>> I am confused about John's point. What dust is deadly? PCB
sawing dust? If yes, I'm not cutting PCB in this particular step
under examination here - but rather plastic (fiberglass?...) from
the edge connector body - though I've occasionally cut PCB and
wasn't aware there's an ominous aspect to it. John - would you
care to elaborate?
>> Radu.
>>
>>
>> On Sat, Aug 31, 2024 at 10:19?PM John Griessen via groups.io
<> <john@...> wrote:
>>>
>>> On 8/31/24 21:29, Radu Bogdan Dicher wrote:
>>> > I'm sticking with the theory the first (initially
successful) blade, the HSS, is failing now because it dulled.
>>>
>>> The dust is deadly.? You could try using a hacksaw with water
applied.? The water keeps dust from happening, and lets the cuttings
>>> move out as they are made.
>>>
>>> pcb material can be scribed with a sharp pointy blade like a
utility knife or the snap off kind.? Then you can follow that line to
>>> one side or down the middle of the scribe.
>>>
>>> Water cutting usually stops jamming, even with the dull blade.
>>>
>>>
>>>
>>>
>>>
>
|
Jinxie
Precaud
Dave McGuire