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Re: Fw: [projects-in-metal] A $5 2 axis DRO for a small drill press

 

Hi Reg,

That is my favorite manner of drilling.

Centering with a punch & hammer is very difficult te be spot-on.

I use the X-Y coordinate system, calculate the positions and start with the X & Y display on 0 at the corner of the front panel.
The results is perfect, first drilling with a center drill as used on my lathe.
See picture and final result on QRZ.com on my webpage there.

w. greetings,
Herman,
PA0VRE
Re: Fw: [projects-in-metal] A $5 2 axis DRO for a small drill press

 

Where are you getting digital calipers for $2.50?
?I like the idea.
Now how how can we make it adjustable, to use on longer throws?
? I know that would limit the use to 6 in cuts, but if you leave the drill bit and the hole and move the
caliper adjustment, it could work.
???????????????????? Mikek
Re: Fw: [projects-in-metal] A $5 2 axis DRO for a small drill press

 

I can do traditional machinist's layouts just fine which has previously been my regular method. What I can no longer do is get the drill bit on the punch mark accurately. I miss by 0.5 mm or less, but it adds up to be obvious to the naked eye with several jacks in line.

My eyes can't be fixed, so I have to change methods to accommodate the reality of old age.

As my sister says,

It is what it is,
Reg


On Saturday, January 13, 2024 at 06:00:33 AM CST, Alan <g8lco1@...> wrote:


A well known method of locating holes is to use perf or vero board as a drilling template, double sided tape can be used to fix the drill guide to the substrate. You can mark the holes to be used with a spirit marker then remove the markings with IPA. You can get DIL hole patterns perfect with the ready made and very accurate templates.

A good method of laying out panels is to print a paper template using your favourite? CAD package. HP inkjets are generally very accurate and don't need re-scaling to produce accurate templates. You can stick the template to the panel then drill through centres.

?I generally use a laser to produce acrylic front panels, laser engraving produces very good lettering at 600/1200 d.p.i. , vector cutting allows holes and outline cutting. You can spray paint the back of clear acrylic then cut through the paint layer with a laser.?

?There are two-layer engraving laminates with a thin top cap layer and a contrasting colour underneath, the laser removes the cap? with very sharp lines to produce lettered and perforated panels that are very durable and pro looking.

Regards, Alan G8LCO.
Re: A pot box

 

¿ªÔÆÌåÓý

Goodness me! That picture brings back memories.? I haven't seen one of those in 55 years.? ...and yes it had two light bulbs mounted above it in a large electrical switch panel.? Nearby were two large handled switches, one marked increase/ decrease? engine speed and the other operated the circuit? breaker.?
The sequence was exactly as you describe,? after starting the two 750kva diesel generating sets with compressed air,? the two were synchronised and a breaker closed to parallel them up.? There was a multi-pin plug which you pulled out,? rotated and pressed back in to select synchronise engines together or synchronise to incoming supply.? When connecting in parallel to the utility supply the trick was to get the synchroscope rotating very slowly in a clockwise direction using the speed adjust switch and close the breaker just as the needle hit 12 o'clock then quickly increase engine speed again. This procedure was to ensure we didn't feed power back into the grid, (there was a reverse power trip breaker located in the utility substation). The engines didn't really increase speed,? only went to leading phase to take over the load and when the utility power meter dropped to about 100kw incoming you tripped the incoming breaker.?
The engines were twin English Electric V8 900hp 750rpm with Napier turbochargers which you could hear spin up until they went supersonic as you drew more power.?
Did this every Tuesday. I was in my late teens at HF Point to Point Station Ongar in southern England. Great memories! Paul






-------- Original message --------
From: Gordon Batey <gpbatey@...>
Date: 1/12/24 20:06 (GMT+00:00)
Subject: Re: [Test Equipment Design & Construction] A pot box

And if you don¡¯t have this (synchroscope) you can go old school and use TWO incandescent light bulbs in series (on EACH leg) and watch them go from full brightness to no brightness.? Adjusting the speed of the generators determines how fast the blinking occurs.? At a no blink rate the generators are in a zero beat situation.?

?

I once visited a large Navy hospital that had several large backup generators.? They got them all up and running connected in parallel and then connected to the commercial power coming into the facility.? Raised the voltage and took over the load and then cut the commercial power away to let the generators carry the load for a test time.? Did the opposite to go back on commercial power.? A seasoned navy chief did this every Friday evening.? Don¡¯t know what they did when he retired, but it was great to watch.

?

Gordon WA4FJC

?

From: [email protected] <[email protected]> On Behalf Of W6KX
Sent: Friday, January 12, 2024 1:17 PM
To: [email protected]
Subject: Re: [Test Equipment Design & Construction] A pot box

?
Re: Fw: [projects-in-metal] A $5 2 axis DRO for a small drill press

 

¿ªÔÆÌåÓý

A well known method of locating holes is to use perf or vero board as a drilling template, double sided tape can be used to fix the drill guide to the substrate. You can mark the holes to be used with a spirit marker then remove the markings with IPA. You can get DIL hole patterns perfect with the ready made and very accurate templates.

A good method of laying out panels is to print a paper template using your favourite? CAD package. HP inkjets are generally very accurate and don't need re-scaling to produce accurate templates. You can stick the template to the panel then drill through centres.

?I generally use a laser to produce acrylic front panels, laser engraving produces very good lettering at 600/1200 d.p.i. , vector cutting allows holes and outline cutting. You can spray paint the back of clear acrylic then cut through the paint layer with a laser.?

?There are two-layer engraving laminates with a thin top cap layer and a contrasting colour underneath, the laser removes the cap? with very sharp lines to produce lettered and perforated panels that are very durable and pro looking.

Regards, Alan G8LCO.



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Re: A pot box

 

An interesting example of the benefit of power line impedance arose years ago at Voice of America transmitting sites where sites outside the USA often generated their own power.? When multiple AM-modulated high-power transmitters carried the same program, this played havoc with the generators and voltage generation.? Delay devices in the audio path between transmitters reduced this problem.?

At Greenville, North Carolina, it was economically advantageous to run the sites' 1 MW generators on hot summer afternoons.? Even though these might carry the light midday transmission loads, connecting to the power line greatly improved voltage regulation in the presence of modulation.? In effect, modulation peaks caused currents to flow back and forth between the generators and power lines, with the automatically-synchronizing switch-gear maintaining an average generator output of 1 MW.?

Utility power was delivered to the sites at 115 kV and transformed to 4160 V at substations for the buildings and transmitters.? Generators connected via the switchgear to the 4160 V side.

Bruce, KG6OJI
Re: A pot box

 

While I was a in the Navy the Electricians aboard ship had a simple way of switching from Ships Power to Shore Power, and vice-versa.
Turn one off one turn on the other.? I never understood why they didn't match phase rotation.? I think it involved Laziness.

Leon Robinson ?? K5JLR

Political Correctness is a Political Disease.

Politicians and Diapers should be changed
often and for the same reasons.


On Friday, January 12, 2024 at 02:06:18 PM CST, Gordon Batey <gpbatey@...> wrote:


And if you don¡¯t have this (synchroscope) you can go old school and use TWO incandescent light bulbs in series (on EACH leg) and watch them go from full brightness to no brightness.? Adjusting the speed of the generators determines how fast the blinking occurs.? At a no blink rate the generators are in a zero beat situation.?

?

I once visited a large Navy hospital that had several large backup generators.? They got them all up and running connected in parallel and then connected to the commercial power coming into the facility.? Raised the voltage and took over the load and then cut the commercial power away to let the generators carry the load for a test time.? Did the opposite to go back on commercial power.? A seasoned navy chief did this every Friday evening.? Don¡¯t know what they did when he retired, but it was great to watch.

?

Gordon WA4FJC

?

From: [email protected] <[email protected]> On Behalf Of W6KX
Sent: Friday, January 12, 2024 1:17 PM
To: [email protected]
Subject: Re: [Test Equipment Design & Construction] A pot box

?
Re: A pot box

 

¿ªÔÆÌåÓý

And if you don¡¯t have this (synchroscope) you can go old school and use TWO incandescent light bulbs in series (on EACH leg) and watch them go from full brightness to no brightness.? Adjusting the speed of the generators determines how fast the blinking occurs.? At a no blink rate the generators are in a zero beat situation.?

?

I once visited a large Navy hospital that had several large backup generators.? They got them all up and running connected in parallel and then connected to the commercial power coming into the facility.? Raised the voltage and took over the load and then cut the commercial power away to let the generators carry the load for a test time.? Did the opposite to go back on commercial power.? A seasoned navy chief did this every Friday evening.? Don¡¯t know what they did when he retired, but it was great to watch.

?

Gordon WA4FJC

?

From: [email protected] <[email protected]> On Behalf Of W6KX
Sent: Friday, January 12, 2024 1:17 PM
To: [email protected]
Subject: Re: [Test Equipment Design & Construction] A pot box

?
Re: A pot box

 

¿ªÔÆÌåÓý
Re: A pot box

 

I once used an virtually infinite dummy load.? We were testing gas turbine powered generator sets and needed dummy loads that exceeded 40KW.? The solution was to connect the running generator to the power grid with a device that triggered the contactor at the zero crossing point of the sine wave.? Once that was done, we simply tweaked the generator output voltage until we had the working load we needed.? Problem solved AND we used the generated power to lower our electric bill.
Fw: [projects-in-metal] A $5 2 axis DRO for a small drill press

 

This is not an electronics project per se, but as it is specifically intended for drilling front panels, etc. I thought I'd give a heads up on the radio oriented lists. Travel is slightly larger than 3" x 6" which should suffice for getting holes in a straight line.

Have Fun!
Reg


----- Forwarded Message -----

From: Reginald Beardsley via groups.io <pulaskite@...>
Sent: Thursday, January 11, 2024 at 02:35:04 PM CST
Subject: [projects-in-metal] A $5 2 axis DRO for a small drill press

It's?been?a?long?time?since?I?posted?anything,?but?my?shop??now?has?lighting?and?by?summer?should?be?fully?operational?after?being?"storage?only"?for?7-8?years?as?I?was?inundated?by?Dad's?stuff.??The?drill?press?being?one?of?several?he?left?me.

A?pair?of?$2?"carbon?fiber?composite"?0.1?mm/0.1"?digital??calipers?and?some?bits?of?aluminum?angle?and?screws.Three?holes?drilled?and?tapped?8-32?in?the?vise.

This?setup?is?for?drilling?PCBs?and?enclosure?holes?for?switches,?knobs,?etc?for?small?electronic?projects.

Obviously,?one?of?many?such?"DRO"?setups,?though?I?think?I?can?claim?the?cheapest?at?least?for?the?next?few?minutes.??The?Clausing?lathe?and?mill?will?be?getting?nicer?readouts.

Have?Fun!
Reg





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Re: A pot box

 

I think you meant to type either 1000 watt or 1 kW load. I doubt if you
have a 1 Megawatt load.

73 (Regards).

Max K 4 O D S.

I've Never Lost the Wonder.

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Paul
Amaranth
Sent: Wednesday, January 03, 2024 7:20 PM
To: [email protected]
Subject: Re: [Test Equipment Design & Construction] A pot box

On Thu, Jan 04, 2024 at 12:59:10AM +0000, Reginald Beardsley via groups.io
wrote:
All those verniers cried for something to do, so I built a box with
banana jacks and 100k and 1M linear pots.? Not sure I'll ever use it, but I
had all the stuff on hand. Took a *lot* more time than I expected.

Have Fun!
Reg
When building a complete instrument it usually takes me 2-3 times as long
to package it as it does to design/build the electronics and software.
Case fabrication, layout, labeling/painting, assembly, finding all the
bits, it all takes time.

A while ago I picked up an Acme PS2L-1000 kilowatt electronic load. You
can sometimes find them fairly cheap. They're electrically programmable,
but don't have any fancy controllers in the instrument (hence why they're
cheap). I built this unit to interface the load with a PC for logging and
programmatic control. Communication is over a USB or rs232 serial link
with a simple protocol.

BTW, if anyone has one of these loads and wants my design, just ask. I'd
be happy to share.

Paul


--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@... | Unix/Linux - We don't do windows
Re: [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

 

Thanks, I think I need a set of those.

FWIW this is the part of the URL that doesn't carry yur personal information.

https://www.temu.com/goods.html?_bg_fs=1&goods_id=601099520034771&sku_id=17592231281850


On Friday, January 5, 2024 at 09:24:58 PM CST, Michael A. Terrell <terrell.michael.a@...> wrote:


Re: [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

 

Re: [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

 

Brian,

Lots of vendors link a low cost option in a listing which includes the featured item at much higher price. Your list will grow forever. List scam tricks instead.

I got such a $38 bait and switch antenna for free when I thought I ordered a mag loop antenna and got a short whip with some LC circuit feeding it. Seller didn't ask for it back. I got a full refund.

Bought a mag loop from another vendor who also showed a stand I did not get. I got most of the cost of a stand as a partial refund. Stand from another vendor arrived today and works great. Just the ticket for my Icom 705.

I'm getting in a real lather to get relicensed. I was occasionally keying through the entire alphabet a 20 wpm today without an error (1 in 20 :-(.

When I got single signal reception on a station 30 Hz above and 50 Hz below 2 stronger stations during a contest 5 days after I got my 705 I was hooked on CW. 3 stations running QSOs in 100 Hz? Wow! That is super cool.

Overall, I'd have to rate Aliexpress, Temu and ebay about equal on customer support. But *all* are time consuming.

Have Fun!
Reg


On Friday, January 5, 2024 at 08:53:05 PM CST, Brian <brianclarke01@...> wrote:


Hello Reg,

?

I have set up a folder where I put AliExpress misleadingadvertising; recent cases include:

¡¤????????several Chinese vendors appear to be offering copies of NeumannU-87 and AKG C-414 condenser microphones for between AU$13 and AU$28; but whenI try to order, I find it¡¯s just for the shock-mount that doesn¡¯t appear in theadvertising image.

¡¤????????when I tried to buy a multi-way military circular connector, oran assembled amplifier, I discovered that the advertised unit price onlyapplies if I order 5000.

¡¤????????a worse example was when I paid AU$350 for a Canon lens andreceived a very cheap copy of a Rolex watch; the vendor wouldn¡¯t accept areturn for a refund. And of course, the watch didn¡¯t have a provenancecertificate ¨C so, it was effectively worthless except as wrist bling.

Telling AliExpress of these marketing tricks gets fat nowhere.So, caveat emptor, eh?

?

Don¡¯t get me onto eBay. Its business model is to encouragebuyers; eBay only earns its Shylockian commission when a buyer pays. Vendorsare there under sufferance to entice buyers. Each time I seek help from eBay asa vendor where a buyer has claimed damage or non-delivery, I get nowhere. Inotice now that eBay demands a fee upfront when you attempt to correspond witha call centre monkey whose native language is Spanish or Mongolian.

?

I agree that a vernier drive for US$5 is a bargain, even when it¡¯sonly for 300 degrees; it¡¯s a lesser copy of a Japanese original that did 360degrees and came with several replaceable dials ¨C I used a couple with 180degrees dials on a HB antenna coupling unit. I have a HB linear PSU where Iused a 10 k pot for coarse setting of output Voltage and a 100 Ohm pot for fineadjustment. That 300 degrees vernier drive on the 10 k pot on its own would besimpler. But then I¡¯ld need to redesign the front panel ¨C perhaps about time ¨Cthere are controls on the back that could benefit from being at the front.

?

Cheers, Brian

?

From:[email protected][mailto:[email protected]] On Behalf Of ReginaldBeardsley via groups.io
Sent: Saturday, 6 January 2024 2:18 AM
To: [email protected]
Subject: Re: [Test Equipment Design & Construction] [qrptech] FYICheap ($2!) vernier dials from Aliexpress

?

I see that a lot (in cases 2x more) . I don't know if theyare hoping you will reorder without checking the new price, exchange ratechanged or something else. The working search key is the part number and thereare lots of sellers. I put all examples of a potentially low price option Ifind in my cart and then delete all but the cheapest as there is no way to finda listing again unless you've bought it before that I can find.

Knowing that there *are* low cost, well made dials is a huge boon. Can't look forwhat you don't know to look for. Ebay paints a very pessimistic picture ofpricing. I wasn't looking for these. They just showed up on the Aliexpress pageso I searched on the part number and picked the cheapest option at the time.

At $5 US they are still a great deal in my book. I'm going to mount one minusthe ugly black plastic on a black anodized front panel for a QRP rig.

Have Fun!
Reg
Re: [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

 

¿ªÔÆÌåÓý

Hello Reg,

?

I have set up a folder where I put AliExpress misleading advertising; recent cases include:

¡¤???????? several Chinese vendors appear to be offering copies of Neumann U-87 and AKG C-414 condenser microphones for between AU$13 and AU$28; but when I try to order, I find it¡¯s just for the shock-mount that doesn¡¯t appear in the advertising image.

¡¤???????? when I tried to buy a multi-way military circular connector, or an assembled amplifier, I discovered that the advertised unit price only applies if I order 5000.

¡¤???????? a worse example was when I paid AU$350 for a Canon lens and received a very cheap copy of a Rolex watch; the vendor wouldn¡¯t accept a return for a refund. And of course, the watch didn¡¯t have a provenance certificate ¨C so, it was effectively worthless except as wrist bling.

Telling AliExpress of these marketing tricks gets fat nowhere. So, caveat emptor, eh?

?

Don¡¯t get me onto eBay. Its business model is to encourage buyers; eBay only earns its Shylockian commission when a buyer pays. Vendors are there under sufferance to entice buyers. Each time I seek help from eBay as a vendor where a buyer has claimed damage or non-delivery, I get nowhere. I notice now that eBay demands a fee upfront when you attempt to correspond with a call centre monkey whose native language is Spanish or Mongolian.

?

I agree that a vernier drive for US$5 is a bargain, even when it¡¯s only for 300 degrees; it¡¯s a lesser copy of a Japanese original that did 360 degrees and came with several replaceable dials ¨C I used a couple with 180 degrees dials on a HB antenna coupling unit. I have a HB linear PSU where I used a 10 k pot for coarse setting of output Voltage and a 100 Ohm pot for fine adjustment. That 300 degrees vernier drive on the 10 k pot on its own would be simpler. But then I¡¯ld need to redesign the front panel ¨C perhaps about time ¨C there are controls on the back that could benefit from being at the front.

?

Cheers, Brian

?

From: [email protected] [mailto:[email protected]] On Behalf Of Reginald Beardsley via groups.io
Sent: Saturday, 6 January 2024 2:18 AM
To: [email protected]
Subject: Re: [Test Equipment Design & Construction] [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

?

I see that a lot (in cases 2x more) . I don't know if they are hoping you will reorder without checking the new price, exchange rate changed or something else. The working search key is the part number and there are lots of sellers. I put all examples of a potentially low price option I find in my cart and then delete all but the cheapest as there is no way to find a listing again unless you've bought it before that I can find.

Knowing that there *are* low cost, well made dials is a huge boon. Can't look for what you don't know to look for. Ebay paints a very pessimistic picture of pricing. I wasn't looking for these. They just showed up on the Aliexpress page so I searched on the part number and picked the cheapest option at the time.

At $5 US they are still a great deal in my book. I'm going to mount one minus the ugly black plastic on a black anodized front panel for a QRP rig.

Have Fun!
Reg

_._,_._,_
Re: [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

 

I see that a lot (in cases 2x more) . I don't know if they are hoping you will reorder without checking the new price, exchange rate changed or something else. The working search key is the part number and there are lots of sellers. I put all examples of a potentially low price option I find in my cart and then delete all but the cheapest as there is no way to find a listing again unless you've bought it before that I can find.

Knowing that there *are* low cost, well made dials is a huge boon. Can't look for what you don't know to look for. Ebay paints a very pessimistic picture of pricing. I wasn't looking for these. They just showed up on the Aliexpress page so I searched on the part number and picked the cheapest option at the time.

At $5 US they are still a great deal in my book. I'm going to mount one minus the ugly black plastic on a black anodized front panel for a QRP rig.

Have Fun!
Reg
On Friday, January 5, 2024 at 03:18:09 AM CST, Brian <brianclarke01@...> wrote:


Hello Reg,
Thanks for the heads-up.
When I tried the link you sent, the price of one landed in Australia would be US$4.50 at today's exchange rate.
73 de Brian, VK2GCE0


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Reginald Beardsley via groups.io
Sent: Wednesday, 3 January 2024 10:49 AM
To: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
Subject: Re: [Test Equipment Design & Construction] [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

An update on these:



The range of rotation is ~300 degrees with clutched stops at the ends. They take a 6 mm shaft, so drilling out is needed to accommodate 1/4" shafts.? They are intended for single turn pots.? So you only get 0-60 in 180 degrees. However, with laser engravers common, a custom dial shouldn't be a problem.? So for anyone who is fond of pure analog radios they are a steal.

I've attached one to an existing? breadboard variable and also showed the bracket which is included with an air trimmer in position, but not attached.? The air trimmer shaft just isn't long enough.

There are a slew of other sellers, possibly at better prices. It changes constantly.

This is all I have to say on this thread unless someone has a question.? I thought I should give people a heads up that these were available at such reasonable prices.

Have Fun!
Reg

NB link repeated because I forgot to copy the test list.







Re: [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

 

Hello Reg,
Thanks for the heads-up.
When I tried the link you sent, the price of one landed in Australia would be US$4.50 at today's exchange rate.
73 de Brian, VK2GCE0

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Reginald Beardsley via groups.io
Sent: Wednesday, 3 January 2024 10:49 AM
To: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]
Subject: Re: [Test Equipment Design & Construction] [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

An update on these:



The range of rotation is ~300 degrees with clutched stops at the ends. They take a 6 mm shaft, so drilling out is needed to accommodate 1/4" shafts. They are intended for single turn pots. So you only get 0-60 in 180 degrees. However, with laser engravers common, a custom dial shouldn't be a problem. So for anyone who is fond of pure analog radios they are a steal.

I've attached one to an existing breadboard variable and also showed the bracket which is included with an air trimmer in position, but not attached. The air trimmer shaft just isn't long enough.

There are a slew of other sellers, possibly at better prices. It changes constantly.

This is all I have to say on this thread unless someone has a question. I thought I should give people a heads up that these were available at such reasonable prices.

Have Fun!
Reg

NB link repeated because I forgot to copy the test list.
Re: [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

 

Just send the link over man. Sand n###y is on the spot.

On January 4, 2024 7:34:28 PM GMT+01:00, "Michael A. Terrell" <terrell.michael.a@...> wrote:
I should have Fiber optic service soon, but thank you Tam. It is colder than usual in Central Florida.right now, and this Hughesnet system doesn't work well. Rain or heavy fog completely kills it. Sometimes for days at a time.
I wouldn't be able to download the screenshot anyway. It took over a dozen attempts just to open Gmail.

With best regards
Tam HANNA

--
Enjoy electronics, 3D printing and cigars? Join more than 21000 followers on my Instagram at

Re: [qrptech] FYI Cheap ($2!) vernier dials from Aliexpress

 

I should have Fiber optic service soon, but thank you Tam. It is colder than usual in Central Florida.right now, and this Hughesnet system doesn't work well. Rain or heavy fog completely kills it. Sometimes for days at a time.
I wouldn't be able to download the screenshot anyway. It took over a dozen attempts just to open Gmail.
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