Member postings for John C

Hi Nick,

Have you thought of a collet chuck? You should get better repeatability than from a 3-jaw, which will most likely suffer in the region of 3 thou run - out. An ER 25 or 32 collet chuck is available from the usual suppliers. I would get a D1-3 backplate from Roatagrip.

An example of a collet chuck is here:**LINK**

A backplate is here:**LINK**

John

Thanks all for the suggestions. I took the paxolin terminal block off and there were just 3 wires disappearing into the body of the motor - nothing connected to N at all. I checked the resistance between each of the other terminals and it was about 80 ohms. So if the motor was wired in star, that would be the resistance of two windings in series, if it was in delta it would be the parallel resistance of one winding and two windings - which I think is 1.5. I didn't think either way would hurt the inverter...(famous last words)..so wired it up and it runs perfectly! I haven't check the speed yet - it has 2880 on the motor plate, but it works fine and runs fast enough to force air through the motor to cool it.

Thanks agin,

John

Noted, Thanks!

Ok, thanks for the replies. I will give it a try!

Rgds,

John

I have acquired a Taylor Hobson engraver with a 1/4 hp AC motor. The motor plate says 220/380/440 V. The motor has a bakelite terminal block marked C B A N. One wire of the 3 phase supply goes to each of the C B A terminals; N has no external connection. Can I convert this motor to run on a 220v static inverter? Or, will any damage occur to either motor or inverter if I use the connections as is? Loss of torque is no problem.

Thanks in advance,

John

Edited By John Corden on 07/07/2014 18:54:40

Rod, I like your idea! I wear bifocal safety specs in the workshop, but they are only corrected in the small viewing area - the majority of the lens is uncorrected. . I will investigate a pair such as you describe. I'm sure Specsavers will tell me, but may I ask the cost of your glasses?

Many thanks,

John

(edited for fat fingers!)

Edited By John Corden on 03/07/2014 18:30:23

Another one for Simply Bearings. Ordered Wed, arrived Thur. This was using the free delivery option that 'may' take up to 7 days - fair enough, but when it arrives the next day that is a bonus!

John

Have you got the collet set up correctly? On my ER collets the front of the collet is flush with the front of the closing ring when tightened up. The collet has to be 'manipulated' into the closing ring, then the cutter inserted in the collet.

Rgds,

John

Brian Caddy of Slideway Services, Nuneaton is only just north of Brum! http://www.slidewayservices.co.uk/

He did my Super 7 to a very high standard and a fair price.

Rgds,

John

I did the tang to drawbar mod today. I had a nice chuck with integral MT3 taper mount (integral as it uses less headspace in the mill) but wanted the security of a drawbar. So, with JS's suggestion above, and having read an article by Tubal Cain (Tom Walshaw) I set to. I elected to hold the chuck using a dowel held in the chuck's own jaws and a collet in the lathe:

Using a centre in the tang end, I turned a parallel section at the small end of the taper:

With the centre still in place, I set up the fixed steady on the turned portion of the shank:

I then took the chuck out and cut off the tang. I found that the tang was quite hard - a file skidded off it, but a cutting disc in a Dremel lookalike got through:

Then it was just a question of using a carbide tipped tool to gently turn down the end, drill - again, I started with carbide, but eventually reached softer metal - and tap for the drawbar. Except I didn't have a 3/8 whit tap......so that is a job for another day!

However, the method of holding the tang for machining, using its own chuck, worked well. The tang end was harder than I expected though, and i ended up grinding some of the metal away. In hindsight perhaps i should have cut more of the tang off in the first place using the disc.

regards,

John

Edited By John Corden on 05/03/2014 19:55:35

Edited By John Corden on 05/03/2014 19:56:03

Hi Neil,

Not sure about refillable ones, but the small sparkets type cylincers - single use -  are used in CO2 powered air guns. Search fleabay for 'CO2 Powerlets', or try your local hunting/shooting/fishing supplier.

Rgds,

John

Edited By John Corden on 16/02/2014 21:11:48

Hi Harry, I made an adapter to allow me to use a grease gun, but filled with oil, to get to that nipple. It is just an ally rod, drilled through and tapped at one end for a grease nipple, and chamfered at the other end to suit the existing oil nipple. I use the grease gun held 'upside down' to stop the oil escaping.

Just up the A19 a bit from you: http://nsert-uk.com/wordpress/

Another one for Tracy Tools. Ordered 1500 Wed, arrived Thursday morning. Excellent!

Well, Curiouser and Curiouser! I just went to the Yahoo Groups bookmark that I always used - which had begun directing me to the BT home page - and i got straight to the Yahoo Group page!

Thanks for the replies though.

Happy New Year!

John

I've just tried to visit the Yahoo groups that I subscribe to and just keep getting redirected to the 'new' BT home page. Have I missed something? I haven't tried JS's link - I use Chrome. A google search for Yahoo groups didn't turn up anything relevant to not accessing groups.

Thanks,

John

I have found the Verdict repair service very helpful in the past, and they do repair makes other than their own.

Worth a phone call!

**LINK**

Rgds,

John

Because: it shows that UK engineering is alive; that UK innovation is alive;  it is providing jobs in engineering for many people; if it takes off (pun intended) it will provide jobs for many more; if we do not do it someone else will and will reap the rewards. That's good enough for me.

Rgds,

John

Edited for semi colons.

Edited By John Corden on 05/12/2013 21:51:04

Very interesting link to engine development:. There is a short video explaining what is new.

**LINK**

Seems we can still make stuff!