Member postings for mark smith 20

Have you removed the bracket at the back of the horizontal drive unit ,then the horizontal head should slide off after removing the Y leadscrew.

So you cant just raise the vertical saddle until it disengages from the nut allowing you to lift the saddle off the top of the column?

The carriage has to come of the top of the column its not easy its very heavy,i had to attach a make shift pully to the rafter in my shed roof and my wife held the rope (with much complaining ) whilst i lifted off the top of the column whilst standing on the base of the machine. Two strong people may be able to lift it off without needing a pulley or winch.

Of course the horizontal drive part has to be removed first.

The key i mentioned is in the keyway on the round drive rod in the first photo next to the leadscrew. Its supposed to sit  in the area within the cover where the nut is, lower down on the column. If you remove the cover plate  you can check the key is in place .

Edited By mark smith 20 on 23/12/2019 10:15:24

Edited By mark smith 20 on 23/12/2019 10:26:45

Edited By mark smith 20 on 23/12/2019 10:30:25

Hi David have you checked the key that is in the vertical travel leadscrew, mine has a habit if slipping out which of course stops any movement , it may have jamed something.But may be wrong.

Mark

P.s i had everything to bits apart from the main gearing in the column which was all perfect.

Edited By mark smith 20 on 22/12/2019 20:19:36

Hi Dave, you obviously know alot more than me about amp circuits etc.. The valves do have cans on them by the way but the amp cabinet is open backed, so i havent noticed any heat problems. It has a strip of wood to stop the valves getting knocked though.

These amps were designed by Barry Vyse and mine was probably built in kit form on one of his amp building courses. Hes a very knowledgable guy and worked for Marconi Osram i believe. Wrote a book on the subject.

Do you happen to know which is the cathode bias resistor in the photo of the inside ??

Thanks Mark

Yes theres certainly alot of talented musicians around who never get a break.

A friend of mine made it big, turned him into a ass. L.A, Drugs etc... But he eventually came down to earth . (Frank Dunnery of Its Bites etc..) Great musician but his older brother was better, he never wanted fame and despite offers from all over the place and refusing to fly ended up never leaving the village.

Another friend did quite well , he married that lady out of Bucks Fizz He currently plays with Rick Wakeman.

I know several local guitarists who are very good but never really got a break.Also drummers. Great to listen to in pubs etc.. and can take their hands to any styles of music.

Edited By mark smith 20 on 04/12/2019 20:09:04

Inside my amp ,a real amp with no pcb`s.

I made some here for my southbend when i got it. This was the result of only my third attempt ever at screw cutting. I just used leaded steel and used the original nuts . They were a large improvement in back lash etc on the original screws . Still working fine after a few years. I grafted the threaded section into the original parts using loctite and a pin.

Edited By mark smith 20 on 27/11/2019 11:11:36

Shaun , a slightly larger diameter screw would still work the same in regard to the dials if the pitch TPI is the same .(as long as everything else is machined to fit (the nut, dials ,handles etc...)

Edited By mark smith 20 on 27/11/2019 09:37:59

My view is your depth of finishing cut off the diameter ( 0.06mm - 2.3 thou)is too small for a carbide cutter.

Edited By mark smith 20 on 25/11/2019 10:51:56

Hi Neil,

Sorry no.

Polyethlene when heated will produce an oily paraffin like stuff up to about 450 C ,above that black carbon deposits, various aldehydes, propane ,methylvinylketone and also several other things like acetic acid depending on temperature of course.

Also depending on how fast the temp. is reached which for a laser would be quite quickly.

I regularly send items worldwide by International signed and tracked service.

Now royal mail also offer a tracked service for the same price. Why would anyone pay for just tracked ,when signed and tracked is exactly the same price.

They also state that it is fully tracked all the way. In reality it is tracked until it leaves the UK and after that anything happens from the odd entry for tracking ,to nothing at all . You have to go to the country your sending to`s postal tracking and hope they have scanned it and updated the tracking.

This happens occasionally but often nothing shows up on the tracking. Ive had parcels to the US arrive at the US customs in 1-2 days and then disappear for 3 weeks.

Funnily when you start kicking up a stink they usually miraculously reappear with no explanation of where the parcel has been.

If i use Fedex or UPS , tracking is usually up to date and no problems at all.

Royal mail tracking is a bit of a joke. How come other companies can supply up to date realtime tracking and royal mail can`t ,considering how long the company has been in business.

I believe its usually LDPE (low density polyethylene)

I think hes refering to the clamp /clips with the nuts on that go on either end to fix the motor onto the cradle. Like in this thread.

**LINK**

Recently cut up some hss using a thin diamond disc for angle grinder , much better than the resin bonded ones and far less mess. But didnt work well on brass ,they all gummed up with brass particles.

I agree with Bazyle, you would only really take that bit apart if you were fitting a new leadscrew.

Hi Richard your is probably from around 1958 or maybe later. Mines numbered 1220 but strangely the head is numbered 1224.

Mine was made on the 7th Feb 1956 and sold to the watchmaker and aircraft dial maker Louis Newmark (or the machine was finished being made on that date)

Mine doesnt have needle rollers but the round ballbearing rollers . One or 2 were corroded but i managed to find an old stock stack bearing on ebay and used two piece of that to finish the head stack.

Edited By mark smith 20 on 12/11/2019 19:44:46

Richard what year is your Alexander /number??

Mark

The oxidised layer doesnt lift ,its just the paint has a very weak bond to the oxide surface.