Member postings for colin hamilton

Blimey I can't wait to post my next car boot bargin!! Thanks for the advice. So for the last two digits do I just see which two are aligned and that's the answer?

I'm just back from my local car boot where I picked up a cracking little micrometer for only £2. It seems very well made it all lines up on zero and the dials are clear. Only trouble is it's a bit different to anything I've seen before and is marked as 1 to 10000 and I'm struggling to work out how to read it. The left hand side and the number in the window seems easy enough (in the photo 0.18) but what next?

It does have a lug and your suggestion is fantastic as is your model. Thanks for the advice

Thanks everyone. I love the fact every time I buy a tool I end up making a tool!!

Thanks for the tip. Yes all returns to zero

Now that I'm trying to get into machining I'm always on the look out for car boot treasure. I think I did well today getting this lot for £7.

I've got a couple of questions. How best to clean up the micrometer. It' works fine but has some surface rust and the markings are faint. I'm worried that by trying to sort the rust I'm likely to make the markings fainter.

Also how should I be setting the dti up? The little bracket doesn't seem to fit the post and the dti. Am I missing some bits?

Thanks for the advice. I'll check in the morning

This is getting interesting. I couldn't work out why no value or range was stated. I'll have a look in the morning (my lathe isn't get at my home). It states somewhere I can change the display to motor current. Would that be this value?

It's got single windings. I was helped through reconfiguring it to delta btvghe experts on here. All the details are in one of my earlier post "chipmaster motor windings"

Thanks I managed to spot that when I first set it up.

I reconfigured the motor to 220v 3phase. I sized the vfd on a simple 3 hp motor is 2.2 kW so I bought a vfd rated at 2.2 kW. I am seriously wondering because I went cheap it's only going to be good for 2.2kw on a good day. My lathe is nearly 50 and driving through a similar aged variator. I think I might just go better quality and a bit bigger say 3.5kw and get a bit spare in the bag.

Can anyone recommend a UK trusted supplier of decent vfd's?

I'm happy that the motor is operating OK as best I can. All the insulation resistance was checked on installation. I'm OK with the incoming feed. Its on a stand alone ring (2.5mm twin core and earth) and is no more than 5m from the main box. It all runs fine when I am taking it easy but starts to trip when the tool loading goes up. I do struggle understanding the manual I've copied what I think are the relevant sections below. At the moment the display is set to frequency I think this can be reconfigured to motor current would this be equivalent to actually measuring one of the phases?

I have a chipmaster so I vary the speed via a mechanical variator and it has a clutch so the vfd runs the motor at a constant 50hz. It is tripping on error code 4 which covers a load of sins one of which is over current. I definately bought cheap (you can tell be the manual!!). I am thinking I will simply replace it with something better. That's really the reason for my question will a quality 3hp vfd (3hp motor) be enough or is it still better to somewhat oversize.

I'm running a 3hp 3 phase lathe via a VFD. I matched the VFD to the motor but on reasonable sized cuts 1.8mm off the diameter (on steel) it trips. Is this likely to be one of ghe settings or is it better to oversize the VFD?

Thanks for all the input. I think in going to have a go at making a sleeve out of square stock. It will allow me to raise it up so get rid of the packing. I also like the idea of adjusting the angle of attack to squeeze it into smaller holes. Would I be able to secure it with some grub screws rather than slitting the whole block?

I had my first go at boring today. It went ok but I've no idea if my set up was ok. The boring bar I have is round. What angle should the insert be set at, should the top of the insert be horizontal? It needed a lot of packing to get it to centre line. Is this ok or am I missing something?

That is the case. Trugrip is left hand and 5c is right handed