Member postings for John Baron

Hi Brian,

The usual issue with vibration is out of balance wheels, have you tried truing the stones with a dresser. I have a diamond one that I bought. After using it the vibration almost completely disappeared.

Just re-read your post.  You really need to make some guards for the old one.

Edited By John Baron on 25/08/2018 12:03:17

Hi Guys,

If you strip an old car window screen wiper blade apart you will find two, probably suitable strips of spring steel, one on either side of the rubber blade.

Hi John,

I have a 220/240 volt AC 50Hz motor with around 15 rpm (I would have to check exact speed).

Unfortunately because it is an AC syncronous motor you will not be able to alter its speed it is very difficult to slow the motor down by loading it. Any use to you ? Maybe the gearbox ? Its yours if you want it. I don't remember why I kept it.

The only other suggestion is a car wiper motor. I use one for the table feed on my mill.

Hi Guys,

I would guess 24 volt 3.4 Amp using the first part of the number.

Try putting 12 volts across it and see if it complains. Or if you have a variable voltage PSU with an ammeter, using that would give you some idea.

Hi Guys,

Many thanks for the links and advice given. It is very confusing when the chart and the gears indicated don't match what is actually fitted to the machine.

Swapping the 24 for 34 is probably least trouble. I actually only need four turns of thread.

Thanks guys.

Hi Guys,

I have a Myford S7 with gearbox and power cross slide.

I want to cut a 1 mm thread ! Easy, no, I'm getting very confused by the plate inside the end cover, which gives mm pitches and refers to the gear on the gearbox shaft. The plate gives gear "X" as 60 teeth and gives change gear sizes along with gearbox settings for 1mm pitch thread.

The gear "X" on my lathe has 72 teeth ! Am I supposed to remove it and replace it with the 60 tooth gear ?

Thanks in advance:

Ops, scratch that ! Getting confused by the power in wires. Sorry.

Hi Guys,

Looking at that picture, I would suspect that all seven connections are there. It seems that it has been wired on one side of the terminal block. Lifting the wires and checking with an ohmmeter would confirm that.

Hi Guys,

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.

Hi Guys,

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.

HTH.

Hi Linda,

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.

Hi Tim,

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

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.

Fun times

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.

Hi John,

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

Hello Mark,

Thank you for those two pages.

I forgot to mention in my other post, your FP1 refurb looks superb. I'm quite envious.

Regards:

JB.

Hello Mark,

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.

Many thanks:

JB.

Hi David,

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

Hi Richard,

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

Hi Guys,

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.