Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by pierreraymondrondelle
Keep in bed, both hands flat on the mattress. Should you need light, use a candle, of course matches aren t for you, ask a nurse ! Wall switches, sockets and
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Re: [Homebrew_PCBs] Re: drill pcb (autotransformer notes)
2016-02-25 by Charles R. Patton
Not correct. An autotransformer absolutely does have a core. The advantage of an autotransformer is in the size of the windings and core for a given power
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by keith printy
Bringing up an old radio slowly will only work if it has solid state rectifiers . with a tube rectifier by the time you get its cathode hot enough to work you
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by keith printy
Cheater cords to not defeat the isolation between the set and power. They were used for making repairs by techs that usually knew what they were doing. In
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by keith printy
I remember the scope being grounded.if I was taking measurements on hot chassis equipment I did not use the scope ground connection to that equipment without
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by keith printy
I remember the all American 5. My grandmother had one in a metal case. The plug was not polarized and if you plugged it in the wrong way and touched the radio
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by Boman33
I have been ignoring the back and forth arguing but here is an undiscussed warning: That a VARIABLE auto-transformer (Variac) works stepping down 220V to 110V
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by Brad Thompson
On 2/25/2016 10:39 AM, rolohar@comcast.net [Homebrew_PCBs] wrote: Variacs and autotransformers only have one winding. There is no primary/secondary
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by rolohar@...
Craig........................Silly! Roland F. Harriston, P.D.
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by rolohar@...
Symons: Thanks for the dissertation. It is obvious that you have done your homework. Regards, Roland F. Harriston, P.D.
Re: drill pcb
2016-02-25 by duwaynes@...
While I was in the military, I had several assignments to countries that used 220 volts. First thing after getting there was to purchase several 220-110 volt
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by rolohar@...
A cheater cord was (is) dangerous because it allowed a person access to the TV chassis when the back of the TV set was removed. The original power cord on
Re: drill pcb
2016-02-25 by jim.strohm@...
Roland, let s say (for instance) that you had a 220V device that you plugged directly into a Euro 220V outlet. Then let s say you had a comparable 110V device
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by Harvey White
... It used to be that to get power to a radio (the all American 5) one side of the AC line was connected directly to the chassis, and the other side was
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by symons391@...
I hope this helps for those not familiar with transformer terminology. The most common type of transformer has a winding for the mains & the output voltages
Re: drill pcb
2016-02-25 by craigl2@...
All good points. I have a Mitutoyo digital micrometer which measures to .00005 but, I have difficulty in getting repeatable measurements to less than
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by Cecil Bayona
Don t ever get in a car, about 50,000 people a year die in automobiles, let s all be safe, we need the government to protect us from life.. ... -- Cecil -
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by K5ESS
Another Rebuttal YOU ALWAYS NEED SAFETY WHEN WORKING WITH POWER LINE ELECTRICITY! OK!!!!! TV cheater cords once used in repairing TV sets were known as
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by Stefan Trethan
You know just enough to be dangerous. None of your statements are correct. Cheater cords are not dangerous because they defeat the isolation between the TV and
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by Andrew Volk
I wonder if your added runout is due to the hole being not EXACTLY 0.125”, or one or both of the shafts being a smidge small. Also, if you use set screws
Re: drill pcb
2016-02-25 by craigl2@...
They also make 110 V to 110 V isolation transformers. You could buy a bunch and plug them into all the outlets in your house instead of plugging anything
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by rolohar@...
YOU ALWAYS NEED SAFETY WHEN WORKING WITH POWER LINE ELECTRICITY! TV cheater cords once used in repairing TV sets were known as Suicide Cords because the
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by K5ESS
Autotransformer Rebuttal “The main disadvantage of an autotransformer is that it does not have the primary to secondary winding isolation of a conventional
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by rolohar@...
Disadvantages of an Autotransformer * The main disadvantage of an autotransformer is that it does not have the primary to secondary winding isolation of a
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by keith printy
An autotransformer is similar to how a variac works. I have several of those here ,even some 220 volt ones you would need to make sure the switch is in the
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by Stefan Trethan
The point he makes, correctly, is that the tool does not need isolation since it is designed to operate directly on 220V anyway. Many of the 220- 110 and
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-25 by rolohar@...
Perhaps I do not understand exactly how the autotransformer would be used with the tool you are planning to use. A real autotransformer has only one winding,
Re: drill pcb
2016-02-25 by craigl2@...
Since you would normally be plugging the drill into a 220 wall outlet directly how is plugging it into an autotransformer any less safe? Craig ... Not an
Re: [Homebrew_PCBs] Re: drill pcb
2016-02-24 by rolohar@...
Not an autotransformer You probably want to stay away from an autotransformer in this situation because of line isolation factors. A simple step down of
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-24 by jim.strohm@...
Depends. Most of them are autotransformers. In this case, the full winding is used for 220 and it s tapped halfway down for 110. I got my last two for free
RE: [Homebrew_PCBs] Re: Drilling circuit boards on the cheap:
2016-02-24 by Tony Smith
Thanks, I’ll go buy some. Cheap enough to experiment with. As usual the eBay sellers have no idea what they’re selling, someone does have a listing for
RE: [Homebrew_PCBs] drill pcb
2016-02-24 by Tony Smith
They’re about $30 or so, I’ve got mine clamped to a mini-mill. They work well. For the price they work very well. If you do decide to clamp it to
RE: [Homebrew_PCBs] drill pcb
2016-02-24 by Jeff Heiss
Can standard 1/8” shank PCB drill bits fit in a dental drill? Are there adapters to fit them if not? From: Homebrew_PCBs@yahoogroups.com
Re: drill pcb
2016-02-24 by craigl2@...
I will try to get some photographs within the next few days (it s in the workshop area I have on the other side of town). In the meantime this is the motor I
RE: [Homebrew_PCBs] drill pcb
2016-02-24 by Dennis Shelgren
Just a super cheap one from harbor freight. A much better option would be dental gear. Seriously, most dentists are also home machinists! You need at least 30k
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-24 by keith printy
Aren’t most of these converters to convert 220 down to 120 ? From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] Sent: Tuesday,
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-23 by Jeff Heiss
I’m intrigued by the interchangeable bushings. Maybe one of the bushings, or motor, linear slide or overall unit? Jeff From: Homebrew_PCBs@yahoogroups.com
RE: [Homebrew_PCBs] drill pcb
2016-02-23 by Jeff Heiss
What kind of air drill? Those are some impressive RPMs. From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] Sent: Tuesday, February 23,
Re: [Homebrew_PCBs] drill pcb
2016-02-23 by Dennis Shelgren
Yea, just using the feeds and speeds calculator, I typically go as fast (rpms) as I can manage. Of course I have an air drill for pcbs. 56k rpms max. On Feb
Re: [Homebrew_PCBs] drill pcb
2016-02-23 by Roger Blair
FYI... 110V, USA.
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-23 by mikewhy
Me personally, the 1/2 per second or so leaves a large margin even with bits already starting to dull. Someone else with a slower spindle might find the
Re: drill pcb
2016-02-23 by jim.strohm@...
International voltage converters are widely available in the states. 73 Jim N6OTQ ... Only problem I see with this besides the shipping cost to the united
Re: drill pcb
2016-02-23 by craigl2@...
A feed rate of 29 in./min. equates to drilling through a PCB in a little over 1/10 of a second. Are you really drilling through them this quickly? Craig ...
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-23 by craigl2@...
... This sounds interesting. Are there any pictures avaible? I do not currently have any photographs. I may be able to take some within the next few days. Are
RE: [Homebrew_PCBs] Re: drill pcb
2016-02-23 by Jeff Heiss
This sounds interesting. Are there any pictures avaible? From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] Sent: Monday, February 22,
RE: [Homebrew_PCBs] drill pcb
2016-02-23 by keith printy
Only problem I see with this besides the shipping cost to the united states is ,it requires 220 volts From: Homebrew_PCBs@yahoogroups.com
Re: [Homebrew_PCBs] PCB Drilling
2016-02-22 by camillus
HI JP, Thanks for your info, I do have question though. The punch and dies you used where they hardened steel? And nowadays there are non glass fiber pcb
Re: [Homebrew_PCBs] PCB Drilling
2016-02-22 by bobledoux@...
Ham operators commonly use Manhattan type construction consisting of pads super glued onto blank copper clad. The pads are punched from thinner copper clad
Re: [Homebrew_PCBs] PCB Drilling
2016-02-22 by Jean-Paul Louis
Camillus, Using punch and die to make holes in a PCB is a very bad idea. I was using that method a previous job to cut and punch holes in PCBs for automotive
PCB Drilling
2016-02-22 by camillus_blockx@...
Hi all pcb drillers, I had the idea for a long time to use punch and die for making holes in pcb s. Any people here can make or know someone who can make punch