Member postings for Mark Simpson 1

Thanks Clive, Chris and Muzzer - your thoughts are much appreciated.

Re: the oilite... the inner bearing surface would not be machined, only the exterior which has a step in it to aid location... I had not thought about the lube affecting bonding tho... maybe better with a bit of PB. The current "plastic" bearings are loose and rotation is stopped via the "plastic" key... The pulley is keyed to the shaft so there is no rotation; only slding whne you change speed... The key looks like Delrin and isn't very hard, I guess to act as an overload safety device.

In these machines the Spindle bearings are seperate from the drive bearings, so the only side loads are from the belt which floats between two sprung pulleys...

It seems that although these things are similar, there are a lot of differences in the materials used... apparently these were P.B. until value engineered

Edited By Mark Simpson 1 on 06/01/2017 15:24:00

I've dismantled the head of my Pinacle Excel turret Mill, which is another clone of a varispeed KRV2000 to locate the source of the steadily growing noises within.

As expected I find that the bushes in the spindle sliding pulley are wornout and there is a small "scuff" on the shaft opposite the keyway. There are two split "plastic" bushes 39mm od, 35mm bore and a plastic key. The motor sliding pulley and key seem fine

I contacted Excel in Coventry, and was pleasantly surprised to learn that new bushes and key are available for only £139.60+vat, they were very helpful and konowledgable t.b.h.

Before getting my hand that deep in my pocket I want to try my own repair...

I wonder if anyone has tried making their own from PB or Delrin or?

I've got an oilite bush with 35mm bore which could be skimmed down to fit and then stuck in with bearing retainer...

Hard to imagine I could do any real damage... but would love to hear form someone whose actually done one.

Edited By Mark Simpson 1 on 06/01/2017 13:16:00

Edited By Mark Simpson 1 on 06/01/2017 13:16:51

I found dealing with them a challenge; but the lathe was good value when I got it...

Bought a chester crusdaer deluxe at the summer sale, 5% off and free delivery.... It was "in stock"and they would ring to arrange delivery on Monday so I paid in full (not my natural instinct tbh)

No call etc. regular calls from me, always answered but rarely by someone who actually answer the question, I eventually found that "in stock" could also mean in china or in a shipping container on a ship somewhere...

The one day 8 weeks later it just turned up on a pallet on the back of a truck, no notification call, email or anything.

One missing piece was sent on the next day by a reputable carrier after a single phone call and that's was it.

Chester: medium quality, feature rich products at a great price, crap phone communications, no discernable organisation and definitely no comforting progress emails

The machinery?

Like everyone else I've read the horror stories about gear boxes full of casting sand and swarf everywhere; but it wasn't really like that. everything that needs to be machined well was really well done, if it wasn't machined there was less care... Some of the drilled holes were clearly done at speed with a badly ground drill, but only where it did it does not matter... holding down holes. Paint job is OK, but not wonderful... Chucks are good, spent some time to fit them to the backplates and got about .0003" runout

It's great to use something that doesn't have 50 years of wear in it, like my pre-loved student and southbend machines... Not as elegant, but also good to spend some time machining not trying to fix a tired something or other, or find a 3rd hand spare part...

There's plenty written about actually checking alignment, can I just suggest you check the simplest stuff first...

Is the morse taper bore clean and not dented/bruised and check the headstock morse taper bush for dents and burrs (if it's got one)

All you need do is put a stripe of Black felt pen on the male tapers and gently turn in the bore... If the pattern is not consistent then sort this first.... The bores of my South Bend and Colchester student were both marked by people (before me) jamming in centres and collets without being properly cleaned... Very gentle work with an oil stone or taper reamer made a huge difference

It's worth doing this with your new test bar too, mine came beautifully ground but with a subtle burr at the small end....

If your test bar won't show pretty much zero error at the heastock end the rest is never going to be right.

Good Luck!

Nathan

They are files Native to Autodesk Revit containing BIM (Building Information Modelling) library information. As far as I ever found you can only open them in Revit, though the Onshape viewer from Autodesk in theory supports them

https://a360.autodesk.com/viewer/

Many of the places offering this kind of content also offer dxf and dwg which is pretty universal
http://seek.autodesk.com/category/Doors?q=filetype%3Aapplication%2Frfa

like this...

or this...

or this (much more expensive...)

Always sandwiched between two shoulder/faces/somethings...

I've found a new 7/8" UNC one, for the princely sum on £13.40, fits into my student and has just lifted it onto rollers without a problem. It's rated at 2T

I'm selling my student on, for a bigger lathe, and it will be available when I've done that

How strange, I was just looking for the same thing... for the same reason... Moving my Student

£6.48 from these guys.  (becomes £18.58 whenyou add the VAT and carriage)

http://www.absoluteindustrial.co.uk/lifting-gear-c1/eyebolts-eyenuts-bownuts-c38/imperial-collared-eyebolts-to-bs-4278-p193/s1229?utm_source=google&utm_medium=cpc&utm_term=imperial-collared-eyebolts-to-bs-4278-thread-size-inch-thread-size-inch-ice06&utm_campaign=product%2Blisting%2Bads&gclid=COHWs_Sl5M0CFY4y0wodCCkI9A

Edited By Mark Simpson 1 on 08/07/2016 17:37:48

I rather like a definition of "a bodge" which appears on Traction Talk from time to time....
Bit Of Damn Good Engineering....

Bodge is also the name of our dog

+1vote for the wickes one with the solid basket filter...

Hi Clogs

I've mounted 2 chucks on re-machined L0 catch plates for my student. They came from Ebay and at about £20 a go were much cheaper that the premachined L0 backplates from the like of gloster, and the accuracy was already there.... An ER40 will go onto one at some point soon as I've got a couple of spares.

I added an RDG HBM 150mm 3Jaw, which is much more accurate than the original 40 year old Burnered one, the only downside is it jams more easily with Cast Iron dust. If I need more accuracy I use collet chuck (multibore), or the huge 4 jaw.

Cheers,

Mark

Hi Rainbows.

As another mourner of the former kenyons, I've also been looking for new suppliers as well. I'm currently talking to Macc Laser (off brook st) about some sheet metal, and wondered about Hall and Pickles at Poynton.... did you try them? There's still some angle and plate at Swindels Scrap metal off Windmill street but nothing like there used to be when they took stuff from local engineering firms (Scraggs, Sisis, AZ) etc.

I also buy stuff from Joe at Macc Models, and he's very helpful and has an increasing stock range.

After those I don't know where to go locally, I fix odd bits of farm stuff for friends and sometimes need bigger "lumps" of material they mostly seem to come from scrap or by post

I live next to macclesfield, have a union cutter grinder and happy to do this in the next week or two. PM me some contact details and I'll get in touch,

Hi Fizzy

I bought a few (random) round inserts from fleabay, milled a flat on the end of a piece of1/2" Silver steel, drilled/tapped a hole for an M3 capscrew and used it in my 2" boring head to fly cut the bottom of my chimney casting for my 6" traction engine (7" radius) I was able to remove 10 thou per cut comfortably.One insert deskinned the casting and removed more than 50 thou in total.... I did wonder if it would handle the interrupted cut, but it worked like a dream and gave a pretty good finish....

Cheers,

Mark

Hi Alan

You can get a free personal copy of MEDUSA4 on Linux. There are a lot of Linux users in the personal world for this product.... http://www.cad-schroer.com/products/medusa4-personal/free-private-use.html

I declare an interest that I've earn't my living as a user and still do working for the vendors of this product; but this is free so not perhaps not such a commercial interest. My hobby is turning larger pieces of metal into swarf; which may result in a 6" traction engine one (far off) day.

I can tell you that there is almost zero commerical (CAD) interest in Linux products currently; with the exception of servers for data managment. We've always offered some kinds of unix (well 30 years or so anyway) as well as Windows (Used to be Primos and VMS years ago).

From a vendor point of view, with the possible exception of IOS, there are a lot of compatibility issues across the infinite variations of Linux. You can do it, especially with a Linix savvy person, but there are far more obscure support questions than Bill Gates pet products.

Hope this is of interest

Mark

There are/were MT boring bars available which (I think) is what the holders were designed for... There is a through hole for a draw bar/bolt.

One such from Myford Ltd of Fleabay http://www.ebay.co.uk/itm/like/111209588912

Edited By Mark Simpson 1 on 22/04/2015 11:31:22

I use a 240 - 415,single to 3 phase inverter on my student and XYZ bridgeport clone... was not cheap but certainly better than replacing both of the motors. Bought it from Drives Direct at Nottingham, guy there was very helpful, no connection other than a happy customer.

On the XYZ i dug into the control panel a bit to find 240 in -> 110v Single phase windings on the transformer for the X axis feed motor....

Mine has a MT5, for which you get a short adaptor to bring it down to MT3.

(heres one with a centre in it)

The "Official" collet chuck goes on the L0 SpindleNoze and is massive. It's from Burnerd and has "multi bore" collets. looks like this below. Mine has the Key but there are lever versions as well.

The collets cover a big range but aren't quite as accurate as 5c or ERxx. The big advantage is that you can put long bars through the headstock... The disadvantage is the length it uses up.

They appear often on ebay, price varies a lot.

I would probably just by an MT3 ER40 and use a piece of threaded rod as a drawbar.

Hope this helps!

Mark

John

It would be normal to cover this as intellectual property (IP) rights in the contract between you and your contractor (the guy doing the cutting) or with anyone who works for you.... We write a cad system and sometimes create customer specials on top of the base system; the IP ownership is always explicitly declared in those contracts.

For a long time we, and other vendors, did not sell but only rented our software in France becuase selling required us to make all of the source code available under certain conditions..... Happily this anomally went away after the EU got it's teeth into it.

I suggest you include a clear statement of what terms you are allowing other parties to use your design for and what they are not allowed to do with it..

Mark

Hi

STP (STEP) is the most "standard" of the neutral interfaces, and about 20 years younger than IGES. Both are neutral formats; but right now there is a lot more effort put into reading and writing STEP... it's a pretty intelligent format unless you are transferring parametric 3D.... Typically contains intelligent representations of the geometry

Your TurboCAD reads and writes DXF and DWG, (both of which can contain 3D Data) the format of which is proprietary to Autodesk, though there are some good tools to read them it remains the property of Autodesk. The 3d native data is not so smart, but it can also embed other formats like Autodesk inventor. Turbocad's main business is to be an Autocad clone (and it's very good at it)

STL, VRML, Collada are just facet formats, ok for 3D printing and viewing but with no intelligence, no smooth curves.... last resort

Cheers Mark

in Summary, in my opinion anyway... STP (STEP) should be your first choice for 3D geometry transfer, then IGES, then the proprietary ones...