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Member postings for Jim Butler 1

Here is a list of all the postings Jim Butler 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: If I were coming here I wouldn't have started there... (possibly)
23/09/2019 13:18:07
Posted by Andrew Johnston on 23/09/2019 08:45:36:

. Precision where precision is needed is good, but precision where it isn't needed is simply a waste of resource. smile

Agreed, good enough is perfect.

But for someone who is an amateur machinist, aiming for good precision when it is not really required is good practice for when it is required.

I once made a couple of paxolin spacers for mounting a numberplate. I was rather disappointed when I measured them an found that the difference in thickness was 0.005".

Chasing accuracy for the fun of it?

JimB

Thread: Angle grinders - Dangerous or not
18/07/2019 16:12:32

I had a close encounter with an angle grinder in the past week.

I needed to change from a cutting disc to a wire brush, so I turned of the mains power at the wall and took off the cutting disc an attached the brush.

So far so good, but when I reached out to turn the power on at the wall, the grinder started up.

As I was holding the grinder quite lightly in my left hand, due to the torque reaction it jumped out of my hand and fell at my feet and the wire brush started grabbing at the legs of my overalls.

Luckily it did not grab tightly, and as my right hand was next to the mains switch I was able to kill the power very quickly.

So how did this come about?

As I was handling the grinder in the course of changing the disc/brush I had operated the switch on the grinder to the on position. So as soon as mains power was applied, it burst into life.

The switch on the grinder ((Bosch) is either OFF or locked in the ON position.

Lessons learned:

Always switch off power at the wall when changing discs.

Before switching on power at the wall, check the switch on the tool.

JimB

Thread: Elvis at ARC
31/01/2019 17:46:30

Looks like I am late to the discussion, but I would never have thought that "PPE Guy" was female or looked like Elvis.

But the look was seriously creepy, I also had to scroll away from it as quickly as possible.

JimB

Thread: Battery Packs for Remote Control
28/06/2018 14:02:26

NiMH batteries can be charged by a simple constant current charger, the same as NiCd batteries.

But if left on constant current charge, the NiMH battery will be damaged.

The NiMH type has a very characteristic "hump" in the voltage/time graph as it becomes fully charged.

When the battery is fully charged the cell voltage falls and the cell temperature rises.

A good NiMH charger detects this fall in voltage and cuts the charge.

JimB

Thread: What did you do Today 2018
26/02/2018 01:05:39
Posted by Neil Wyatt on 25/02/2018 12:16:00:

Anybody guess what this is? I have mentioned it before or you can crib the answer from twitter.

Looks like the insides of a slow motion drive, as often used in radio and electronic equipment for tuning dials etc.

JimB

Thread: Why do we never have great documentaries in the Uk that go into detail
30/09/2017 15:25:32

A good film, I enjoyed watching it.

There is a TV programme called "How its made" which appears to be of French Canadian origin but is voiced over by a Brit.

Each half hour programme gives an overview of how two or three different items are made.

It is just the video of the production process and the descriptive voice-over.

I find it quite informative without all the hyperbole and false drama of the average pseudo technical reality programme.

JimB

(First post in this forum).

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