Member postings for Michael Briggs

Patience is a virtue, does anyone know where I can get a top up ?

Edited By Michael Briggs on 25/04/2017 20:44:22

Very nice Matt, something I have been intending to do for a while, but haven't got round to it yet. Regards, Michael

Michael-w,

I'm guessing we're looking at a repeatability of 0.01mm-0.03mm on most lathe chucks made new today, if you want it any better than that you'll need to spend some bucks!

= 0.3937 to 1.1811 thou, please let me know where I can purchase a standard one, regards, Michael

Edited By Michael Briggs on 19/02/2017 23:25:30

Nigel B has the answer.

As David says, Rockwell (Allen Bradley) for example advise : Shields of motor and input cables must be bonded at both ends to provide a continuous path for common mode noise current. and Connect the shields of control cables only at one end. Regards, Michael.

If it's a set you are looking for !: **LINK** !

Hello John,

I can recommend this Wera reversible ratchet, sold as a set here but you can get the ratchet for about £20, top quality, as reflected in the price. The overall length of the ratchet is 87mm or 79 mm from the centre of the hex socket to the end of the handle:

**LINK**

Regards, Michael

+1 on small boring bar.

On a lighter and inconsequential note, about 25 years ago I commissioned a control system in Eire that had Hitachi or Toshiba drives, can't 100% remember which. They only had a four seven segment led display, the fault code for under voltage trip was F followed by OFF, made me laugh.

Generally you can program drives to operate in what is commonly known as two or three wire operation. In this case only two wire is available according to the manual I had a look at. This is very unusual to me, I have configured many different makes and models of drives and this is the first time I have come across this. Looking again at the manual, it is probably due to the low count of control terminals available, ten, five of which are for analogue I/O. Regards, Michael.

Even industrial control circuits dont run at this voltage level for good reason...

The good reason being that in industrial environments equipment gets abused and damaged. 24 vdc would be the better option, 240 vac properly installed and respected is not unsafe. Regards, Michael

Hello Rod, I have had a look in the manual for your drive, the mode of operation cannot be changed. You could use a relay with a 240 vac coil or alternatively use the 24 vdc supply built into the drive. It is only good for 50 ma, there are small interface relays available with coils around 3 k ohms. Regards, Michael

Out of interest, which manufacturers use blacking.

I agree Nick, nothing to do with runout.

Hello Allan,

If the lathe is set up properly you should be able to turn accurately. Runout is a problem only when you move the work piece in the chuck. I am not familiar with Harold Hall's methods but I am sure they will be a good guide to set up your lathe. Regards, Michael.

Hello Bodge, in a Leroy Somer document the noise for 56 size frame single phase motors expressed as sound power level (LwA) is 68 for a 2 pole motor and 58 for a 4 pole motor. Sorry to be a bit pedantic, may be of interest to someone. Regards, Michael

I am sure there will be other members on the forum that can throw more (accurate) light on this than I can. I suspected that a two pole motor would be noisier than a four pole, looking in an ABB publication they are quite a lot noisier though given the racket my Clarke compressor makes, you probably would not be able to tell the difference. Regards, Michael.