Member postings for Michael Cox 1

Thanks for all the comments.

The new single phase input RS inverter has the same output characteristics as the three phase version that it replaced.

The motor does not have a name plate.

I do not want to meddle with inverter because I do not understand them in any detail and that is why I am looking for someone competent in this area to check the installation and program it.

Mike

As a qualified chemist I would like to thank Kiwi Bloke for his excellent summary of what is happening in this case. If the acid had been pure and uncontaminated with copper the pickling solution would have been much less agressive to the steel. Sulphuric acid is fine for pickling copper and items can be left to soak for a long time with little attack on the copper. Iron and steel are attacked by dilute sulphuric acid and the rate of attack is greater if copper is present in the solution as the copper plates out one the metal and forms a galvanic couple resulting in accelerated corrosion.

Mike

A friend has purchased a machine that has a RS inverter with a 3 phase input. He wants to run this machine from a normal single phase supply. He has purchased a new inverter from RS with the same output characteristics but designed for single phase input and this has been installed on the machine. He needs someone familiar with inverters to set the new inverter up and program it correctly. Does anyone one know of an electrician in the Slough, Berkshire area who could do this?

Thanks in advance for any suggestions.

Mike

Try Tak Engineering on Slough Trading Estate.

Ammonia solution (eg household Ammonia) should remove zinc oxide and hydroxide rapidly. It attacks the zinc metal very slowly in the presence of air but the oxide and hydroxide is removed rapidly. Afterwards wash in plenty of clean water.

Mike

A sad loss. He was an inspiration to me when I first took up machining.

Condolences to his family.

Mike

Try:

https://www.gwr-fasteners.co.uk/

They to an amazing range of studs and fasteners. I have purchased LH studding from them in the past.

Mike

Just a thought. Why not use a metal scraper and cover it with self adhesive tape ( parcel tape, PVC insulating tape, Tuff tape etc). Use the coated scraper and then wipe of excess. After the curing time of the adhesive just peel of the tape and the scraper is ready to use again.

Mike

I save the wooden stirrers from Costa coffee for mixing epoxy adhesives. The small tubs of milk supplied with a cup of tea in some cafes I also take home and wash. These make excellent pots for mixing small quantities of Epoxy adhesive.

Mike

Ola Paulo,

Bem vindo.

This group is full of people that are very helpful. Just ask questions and you will get many answers.

Where in Portugal are you located?

Feliz Natal

Mike

Does the motor rattle if run on the bench and not driving the lathe?

I usually run the cutter backwards in order to locate the edge on the material to be machined. Running the cutter backwards does not remove any metal and give a very clear audio indication when the rotating cutter touches the edge.

Mike

Michael - the speed control module I used MFAcomodrills part number 919D29, see:

https://www.mfacomodrills.com/pdfs/Speed%20regulators.pdf

Regards

Mike

I built a power drive for my mill table. This allows slow variable speed for cutting and full speed for the return. The cut direction is selectable. The speed control is based on a pulse width modulated speed controller. Full details are here:

http://mikesworkshop.weebly.com/mill-power-feed.html

Mike

The only problem with acrylic as an insulator is that it has quite a low softening temperature. This makes it usuitable for situations exposed to heat or where the switch may get hot. In these situation phenolic plastics like bakelite , Tufnol and Paxolin are better as they are much more heat resistant.

Mike

I never met John but I had several conversation with him and received very good advice on machining matter

RIP John

Mike

My go to source for electronic components is ESR Electronic Components. Always very helpful and goood delivery.

http://www.esr.co.uk/

Clive, I do not know how similar your X3 is to my little X1 mill but I have added a tacho, see:

http://mikesworkshop.weebly.com/mill-tachometer.html

The tacho unit was supplied with a hall efect sensor but the sensor was too large to fit in a convenient place so a made a simple optical reflective sensor which works well using a reflective strip on the spindle.

Mike

Nearly all copper and zinc corrosion product will be soluble in household amminia solution. This will rapidly dissolve the corrosion products. Unfortunately household ammonia solution, which used to be a common cleaning agent during most of the 20 th century, is now quite difficult to find although it is readily available via ebay. If you use this wash with water afterwards and then rinse with alcohol (methalated spirit, denatured alcohol) and leave to dry.

Merry Christmas to all. Lets hope that the New Year is better than 2020.

Mike