Here is a list of all the postings John Baron has made in our forums. Click on a thread name to jump to the thread.
|Thread: EMC filters for VFDs?|
Assuming that the VFD meets UK/EU legislation it should already have mains filtering built in !
As far as screened cables on the output side, yes I would use them. In Industry they would have armoured cables to the machines anyway, which are earthed and would automatically screen them. Output filters are not advised, since the relatively high frequency content could become distorted and cause other problems particularly with vector control drives.
Just about every old automatic washing machine will have a suitable filter in it. It will be directly connected to the incoming mains lead. Some will have spade terminals, others will have the wires embedded into the case. The case is normally secured directly to the earthed machine frame. The current capacity varies, commonly 6 to 8 amps, though I've seen some as low as 4 amps.
The older ones look like motor capacitors, the newer ones tend to be potted in plastic cases.
|Thread: Flywheel help please|
Have a look around a scrapyard at washing machine pulleys. Most have five spokes and are made of alloy, though some are plastic. I have several, one of the plastic ones I made into a lathe handle.
|Thread: Flat spring stainless steel ?|
Grab an old window screen wiper from a car. The metal backing strip is stainless and is quite hard. I've used them to make replacement return springs for door handles. Works a treat
|Thread: Absorption fridge tech details|
Yes a 12 volt compressor fridge ! Bloody expensive though.
As a point of interest the caravan / camper compressor motors are actually 220 volt and are fed from an inverter VFD to provide the high voltage.
RE: Electrolux 3 way fridge. They use a heat source to boil a liquid which is allowed to pass through a small hole, the gas expands and adsorbes the heat from inside the fridge cabinet.
Search "Boyles Law"
"Boyle, Thompson and Joule, allowed a compressed gas, through a small hole to pass, the gas expanded and became cool" !
An old ryhme from school days.
|Thread: Single phase induction motor speed control|
One way of controlling the motor speed is to vary the frequency of the supply voltage. This can be done by rectifying the mains to turn it into DC, and then chopping up the DC to provide pulses at a high frequency. Say 20 KHz. By modulating the pulses at 50 Hz plus or minus a few cycles will allow the motor speed to be changed up or down.
|Thread: Hello from Lazarus|
I know someone suggested "Zeus" tables ! But could I suggest the "Presto Counsellor" its a free download on the "Presto Tools" web site.
www.presto-tools.com/Downloads Just click on "Counsellor
If you ring them, their phone number is at the bottom of that page, and ask, they will send you a paper copy. Actually it is a very handy 1/2 A5 book.
Edited By John Baron on 21/12/2017 20:18:52
Edited By John Baron on 21/12/2017 20:19:50
|Thread: Good Milling Guide & Deckel FP1|
Thank you for those two pages.
I forgot to mention in my other post, your FP1 refurb looks superb. I'm quite envious.
Thank you for your upload of the FP1 manual, it's much appreciated.
There is however some pages missing ! I've ignored duplicated ones.
The missing pages are:- in bb, 26 & 27 and in cc, 42, 43, 44, & 45.
|Thread: Centre drilling long length, small diameter bar|
For doing the sort of thing that you want to do, I use a length of plastic water pipe over the end hanging out. Two G clamps, a length of wood and a stool.
Edited By John Baron on 06/08/2017 21:20:30 "Spelling"
Edited By John Baron on 06/08/2017 21:21:52
|Thread: What are these stone sticks?|
It is chalk ! Actually its called "French Chalk" and it is usually used for writing on steelwork, often powered and used when mending punctures in your bike tyres tube, to stop the glue sticking to the inside of the tyre.
Edited By John Baron on 06/08/2017 21:14:46
|Thread: Corrosive liquids. ...................................|
Of the three acids mentioned here, hydrofluoric acid is probably the most dangerous ! Because it is an "oily" acid, once on the skin it is extremely difficult to remove and severe damage done from only a few drops. The other two acids can be rapidly dissipated with copious amounts of water.
|Thread: 4 facet drill sharpening jig plans|
Drop John Moran an Email, he is very helpful. I've built the 4-6 facet drill sharpener and I'm very happy with it. I also made a jig to sharpen slot drils and end mills.
It is a bit fiddly to set up, but once you have got your head around it, it becomes very obvious.
I've just looked on the Gadget Builder web site and discovered that my grinder is pictured there, near the bottom of the page.
Edited By John Baron on 18/02/2017 16:58:41
|Thread: Countersinking problems|
Try "Weldon" single hole countersinks. I have a set that goes from 1mm to 25 mm. For holes 5 mm you need a 3 to 6 mm one. That is one of the double ended ones.
|Thread: What AMP power supply for windscreen wiper motor|
I built a window screen wiper motor table drive quite some time ago. I got mine from the local scrapyard for the cost of taking it off the scrap car it was attached to. Actually I got two, one left hand drive and one right hand drive. Neither draw more than 2.5 amps at 12 volts on full load. Mine normally takes about 2 amps and runs at around 8 volts. I actually run it from an old variable voltage lab PSU, which has built in voltage and current meters. I used a tumbler gear mechanism to provide both reversing and disconnection so that the right handwheel can be manually turned.
For a build log.
Edited By John Baron on 07/01/2017 20:36:16
Edited By John Baron on 07/01/2017 20:36:42
|Thread: Leveling and fixing a Myford lathe|
Hi, the stud shown in the lower photo has been screwed too far down into the block under the foot. Slacken the nut underneath and screw it out until it is about two nut thicknesses above the foot. Tighten the nut and adjust the foot support nut as needed. Make adjustments to level the lathe as per the manual.
|Thread: Chamfer Milling|
Depending on how big you want to make the chamfer, I use woodwork router cutters. A 45 degree cutter should work nicely.
|Thread: Unusual thread? well it is to me!!|
5/8" X 24 tpi is the thread on PL259 and SO259 RF plugs and sockets, commonly found on CB radios and the like.
|Thread: Wife's domestic iron|
Somewhere kicking about I have a box containing around a thousand black neoprene cable relief sleeves. They are/were intended to fit into Bulgin kettle plugs.
If you want one or more PM me.
|Thread: WARCO WM-250 lathe family and WM16 mill|
Same with the Mill. I have a mill similar and two people lifted it easily onto the stand. WFWiW I didn't bother bolting the stand down. It is stood on a patch of old conveyer belt.
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