By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for mike mcdermid

Here is a list of all the postings mike mcdermid has made in our forums. Click on a thread name to jump to the thread.

Thread: Refurbed myfords
07/04/2018 22:06:22
Posted by not done it yet on 07/04/2018 21:57:21:

Because they have not sold them?

and there's the reminder why i don't bother with this place anymore disgust

07/04/2018 21:35:28
Posted by Michael Gilligan on 07/04/2018 19:31:22:

Mike,

I've just checked ebay, and found this listing: **LINK**

https://www.ebay.co.uk/itm/FULLY-REFURBISHED-MYFORD-SUPER-7-LATHE-DIRECT-FROM-MYFORD-LTD-HALIFAX/192489528974

'Buy it Now' ... and 24 available !

Like you, I find this rather surprising.

MichaelG.

.

Edit: Now showing 'more than 10' available.

... I also note that the listing states 'New' dont know

 

Edited By Michael Gilligan on 07/04/2018 19:37:12

yes im perplexed

and now you have pointed that out how do they have more than 10 refurbed lathes in?

 

Edited By mike mcdermid on 07/04/2018 21:36:21

07/04/2018 18:55:20

Came across a post on the facebook myford user group (post has been removed)

It seems to link to ebay where it seems you can get a new refurbished myford for 3k, now when you go to their website however they all seem to be 5-6k no where near 3k , is this some weird spoof marketing?

Another thing is whats the trend on ebay where a myford vertical slide or a chuck costs 10k , no one is obviously going to buy one

Anyone got as far as enquiring to myford?

Thread: What tolerance fit for titanium / aluminium.
20/07/2015 23:36:52
Michael don't be daft man I just worked in F1 right from the days where bonding flexures into wishbones was the norm, I'm a composites engineering type but made carbon titanium and aluminium bikes for some companies, it's like having a mastermind specialist subject, sadly mines glue, the strongest ones come from Hexel 3m is a pretty good all rounder but similar to the araldite 2014 and permabond, it's a generic mid strength toughened epoxy
19/07/2015 23:59:23
The dropouts were bonded in you need a bond line thickness of maybe. 5 to. 9 for the adhesive we use Dp420 from 3m though other adhesives will give you similar properties we use 30Mpa as a minimum loctite is generally lower (low 20s) by the time you have taken material tests and type into account all materials don't achieve the highest value stated on the manufacturers literature however, often we achieve 37-48 mpa dependant on preparation, the tops where the crown clamps iirc used to crimp, titanium fork legs are substantially more flexible than the cro mo or mangmoly pace used,

Edited By mike mcdermid on 20/07/2015 00:07:42

Edited By mike mcdermid on 20/07/2015 00:08:53

Edited By mike mcdermid on 20/07/2015 00:09:26

Thread: Beginners TIG
14/07/2015 20:34:55

  <---------  if you click the icon it will take you to my instagram web page

Rule of thumb for stick out depends on the gas lense for example a 12 which is 15mm or 5/8 bore you can get an inch or so ,we do this for welding ti in hard to reach areas  but generally the ceramic opening is a good guide to how far your going to stick your tungsten out for general welding obviously the stickout will also be affected by the type of joint and angle of that joint 

 

A nother good website is migweldingforum as well as welding tips and tricks though its more your garage guys and gals on there big range of people from experienced to beginners

 

One other piece of advice is go watch someone beg borrow or steal time, i find when im teaching someone once they grasp the fundamentals and they all converge in one place it just clicks into place from there they tend to go and start fiddling with settings and seeing how they affect the weld and how it goes along having a baseline that you know is right ....its easier to go from there

Edited By mike mcdermid on 14/07/2015 20:39:29

Edited By mike mcdermid on 14/07/2015 20:43:42

Edited By mike mcdermid on 14/07/2015 20:47:15

Thread: Lathe design not keeping up
14/07/2015 20:32:37
Posted by John Stevenson on 28/06/2015 13:14:32:

Collective answers and questions.

Mike,

Never thought about magnetic strips, how do these cope with flood coolant ? Plus I already had this DRO setup.

Neil,

2 M4 cap heads supplied with the scale, didn't realise you could TiG weld alloy to cast ? wink

Murray,

I'll get some pics from the back later today and post them. Yes the read head is at the rear and again mounts to two existing 1/4" Whit tapped holes in the carriage. I used a slice sawn off a generic scale bracket left over from fitting another kit.

Saddle comes off easy and just as you say. Bracket off, the two dowels are tapped 2BA for an extractor, screws out, they just pull thru. Apron is secured by 4 cap screws, two front, two rear in the 'top wings ' of the apron and it drops clear. Then the saddle slides off the back and you can upend it to remove the retainers if needed.

Long scale will fit where the taper turning should fit which for me isn't a problem as I never use one, much prefering to use a boring head offset in the tailstock. That should be uneventful except for making a read head bracket that mimics the angle of the bed where the TT should sit.

Next job will be bed wipers. Apparently these are available from the 600 group at around £110 to £120 for the 4 plasticy / rubber bits which in my book is a bit excessive.

Toyed with 3D printing the wipers but not sure if there is a suitable filament ?

Perhaps someone knows ? Even buying a full spool will be cheaper and some could be sold on.

Alternative is to think outside the box and redesign them taking off the shelf components so any future replacements cost pence. More on this later plus the rear photo's.

Grass cutting and brick laying calls.

Pretty similar story i just had the magnetic one lying about from another

As other said they are Ip 67 so cooland doesnt affect them When i schemed it out for the bloke it too had the Glass scale hung off the back on the cross slide though i made some clamps to clamp grip the rear flat guideway thus eliminating the 15 degree slant

Thread: Beginners TIG
12/07/2015 21:43:03
80 amps is way too high the current should be around 50 if not using a pulse the rule of thumb being 1amp per though thickness, any gap will also ruin your chances a gap will burn back one sidebar the other, when we weld the joints are almost an interference fit, we build bicycles and weld down to 0.5mm any gap means a bad day....next buy a gas lense you can go as low a 4ltrs and still get coverage the advantage being it won't blow glass out if your in the crotch of a 90 which you get welding box section as youbcould corners and in acute angle pipe joints, too much gas can be bad tungsten grinding is important it will give you varying types of penetration and effects things like arc gap too big an arc gap your voltage increases and the weld is too hot, you get used to burying the tip practically the diameter of the filler wire from the metal to be joined meaning you can weld without wire and autonomously join the parts, to get good takes practice and that is all you can do there is no magic bullet
Thread: Lathe design not keeping up
27/06/2015 12:57:52

A magnetic strip and read had fits in there, if you machine the extrusion the gibs are clear and the angle bolts for the topslide, I cnc a load of brackets to fit a 30 quid mag strip and 80quid read head, photos can be provided

Thread: colchester student taper turning attachment
13/01/2015 17:28:46

Does anyone or has anyone ever fitted the taper turning attachment from a student to a chippie ,i know it will need brackets but its more if the spline on the handwheel fits the spline on the leadscrew?

Thread: Titanium supplier - short lengths.
14/11/2014 00:21:27
How much and what diameter, we make titanium bikes and have got a good supply of it on the shelf
Thread: Setting Up A Tormach PCNC Mill With ATC
31/08/2014 23:11:15
Put boot camp on the mac if its Intel based, then you can run native windows programs without them being virtualized ,however I do know the cam software we use will run natively on a mac , nx is a pricey system but unsurpassed IMHO by any of the other systems I've used with the exception of work NC

Edited By mike mcdermid on 31/08/2014 23:13:18

Thread: British machine tools
11/08/2014 18:47:05
 
 
Posted by Chris Trice on 11/08/2014 03:45:45:
end of. With respect to the definition of the word literally, you'll find a late Colchester is NOT literally a bag of shit.

I think if you were actually sat in the pub we used to go in (the little george on moor end lane)and actually worked in the place that made them your view would be more accurate than it is

even by their own admission the board tried to pull a PR stunt by saying we hold our hands up ,it was a mistake going to china

Edited By mike mcdermid on 11/08/2014 18:57:43

Thread: XJ25 milling machine from Amadeal
10/08/2014 16:55:31

i have an ama25lv

Thread: British machine tools
10/08/2014 16:54:59

Granted a DS&G from pre war Britain will still be some use, or so big industry has a demand for them i can see now how oil country lathes are keeping that company alive

But as hobbiests there's nothing left for you it is literally becoming scrap iron you have to laugh when you see machinery dealers asking 3k for a clapped out chipmaster or harrison m300 ,When I worked in heckmondwike there used to be beds sat at the back of Morrisons seasoning for 10 years before they were ground and scraped in ,in the 90s beds were cast in china they were shit, they came off the boat and got ground i could tell you stories of how they would be ground and twisted by the next day but by then the writing was on wall ,the Bean counters couldn't give a damn (and the men doing the job didn't either ,their pride in workmanship had been removed by managements attitude of "your lucky to be working" unless the books were balanced

A late model harrison is literally a bag of shit ,an early one most likely worn to within an inch of its life if wasnt sold to a school and then we all love a school machine thats been underused but crashed 50 times

, i agree with Bogs disposable society means you will hear people sucjh as on here lament the death of what they knew but things move on, if we buy an 80k CNC machining centre we are quite safe in the knowledge its going to have a useful life of 5 years before its done its work they are disposable items ,then get passed on to the hobbiest whos just happy to have CNC capability

I bought a Boxford 280 nearly new about 2 years ago ,theres already wear in it and play that shouldn't really be considering its used for odd jobs, 2 years old ,as far as quality, i would have been no worse buying from Chester or Warco and buying new every 2-3 years

One day someone will bring back manufacturing machine tools at the hobbiest level or at least a serious level after all the cost of these things goes up yearly I recall when a 25lv mill was 700 quid they are touching 1k now we already proved we can compete with the taiwanese in some markets when we reshored our companies manufacturing but it still remains if the market will pay the price afterall you can buy anything pretty much cheaper

Thread: Chinese CNC Spindles ?
04/07/2014 10:58:02
Posted by Muzzer on 25/06/2014 05:49:03:

The Adaptive Clearing technique used in CAM applications like Mastercam, Solidcam, HSMworks etc isn't ensuring a constant chip thickness at all, it is targeting a more constant tool load which is quite different. If you haven't grasped the difference, there's a great introduction to the basics on the Solidcam website (possibly even a bit laboured) although the same principles seem to be used in the other applications, give or take.

I'm no expert on the matter but it looks as if the "Adaptive Clearing" concept was conceived by a couple of Brits (blog here). The approach sounds pretty simple on the face of it but once you start to dive it it becomes clear this is a pretty involved matter. When you cut into a corner with an end mill using "simple offset" contours, you will find that the cutting surface suddenly wants to extend to perhaps 1/2 of the circumference or more, depending on the stepover. This could be a problem, yet if you reduce the overall speeds and feeds for the whole operation just to make this one situation safe, you end up taking longer than necessary for the rest of the machining. With Adaptive Clearing, the solution is to continuously vary the stepover and feed rate (and spindle speed) to even out the tool loading.

If you have Solidworks, the HSMXpress add-on is free for 2.5D use and includes this functionality. I'm looking forward to trying it out for myself soon. There are a lot more features in these CAM applications than just Adaptive Clearing of course and I am sure there are many patents and PhDs still to be written in the field! Fascinating stuff.

Murray

Murray it does both, some count chip thinning as the more dangerous of the two ,we certainly did,as if you have a square block it can sit there all day going round and round and round just slicing material off if you dont have a good stock definition say a triangle pocket with round corners the software can still make a hell of a mess of it

I dont need to read up on Solidcam as the research establishment i worked at is one of the places that actually developed the core that is sold to other cam companies (i do like to ask dumb questions of the HSM works guys though as they simply have adaptive and that is all)  ,you might note i wrote constant tool engagment, with this comes constant chip load you would never purposefully say stepover 2mm and 1mm in the same cut for example though this could happen due to geometry of the cam part and what ha been removed from the stock , in the background the chip thinning is also being monitored on entry exit and around corners and where a previous cut has left a situation where it might be 2mm in one place and 1mm further down where it could exceed the limitations you notice its arcing spline like toolpaths with differing stepovers ,

also because its monitoring chip thinning there is no speed reduction in or out of corners book speed might say 400mm a min feed a controller also might slow this using g codes when it sees a G02 or G03 but when your watching a cutter doing 5 times this feed in and accelerating out because its adjusted for loads and thinning you start to see the benefits in cycle time

Dont get me wrong i can test the same cutter with 15mm doc 5mm woc in en24t and it will cut the job but i need hp and torque with adaptive and constant chip load/thickness i need less horsepower and torque as the cut is still full depth but as its taking a smaller bite of the cherry with much faster feeds theres a reduction in cycle but no increase in the loads the cutter sees, hence much smaller machines can be as productive as big machines that need to hog material

Edited By mike mcdermid on 04/07/2014 11:03:05

Edited By mike mcdermid on 04/07/2014 11:04:44

Edited By mike mcdermid on 04/07/2014 11:06:17

Thread: Need a CNC mill and lathe
04/07/2014 10:25:47

Dean i have tried to explain this to you

a CNC shop with a 100k machine sat there needs to make a return, its simple buisness im sure you understand a shop that can make 3000 widget for a quid a piece will not be interested in making 50 parts at 25 quid ,we have been down this road we bought our own equipment even when i worked in industry it was high value one offs or thousands at repetitive rates very rarely in between unless it was a favour for one of the gaffers mates

 

however as someone who has a commercial buisness machining parts i could buy one of yours copy it and be making them an hour later for half the price you can ,it happens i have seen this working both in taiwan and britain and if you think a customer will go "you ripped such and such off" i can tell you when you offer them the same part for less money they wont, this is becoming all too commonplace now where the money talks

 

you need to find a working relationship with someone outhere that can make it for the right price and qty to win all round

 

another thing that senior 200 cnc lathe on ebay ...its 2.5k well worth every penny for a hobby guy making a few bits in a garage

Edited By mike mcdermid on 04/07/2014 10:26:43

Thread: Models to make you feel inadequate?
21/06/2014 22:46:38

http://www.craftsmanshipmuseum.com/park.htm

ill let you judge for yourselves

Edited By mike mcdermid on 21/06/2014 22:47:27

Thread: Chinese CNC Spindles ?
21/06/2014 11:14:07

BT10 i a standard and 350 quid however is what you will routinely pay for bt40 big dai showa shunk in fact any of the sub micron runout holders, collets then run around 60 quid a go but do actual push runout to whole new levels

Constant tool engagement keeps the tool in the material with constant chip thickness and thats the key keeping it in the material, ONE THING YOU NEED A CAM PACKAGE TO TAKE ADVANTAGE OF THESE MODERN WONDERMENTS

a lot of people dub it as trochoidal milling which it isn't it has significant differences but heres an example tool breakage even in toolsteels is very rare

https://www.youtube.com/watch?v=CORSb2NtV0Q

its most useful for little underpowered machines where the choice of hogging material off is not an option but lots of fast cuts are as in hobby sized machines with high rpm low torque spindles its also very beneficial for tiny cutters where plodding around taking tiny cuts just rubs the mill to death and causes premature breakage

 

 

Edited By mike mcdermid on 21/06/2014 11:15:23

20/06/2014 23:45:52

I'm a bit puzzled how on a hobby CNc you make the jump to a big dai Showa toolholder

on an ISO spindle for a good CNc like the Mazak or DMG we use the taper is made to a certain standard up to the gauge line from there up you look at contact this is your first area runout issues can start an er system is not really in the same league with low contact in the taper it will deflect an er32 collet which has low stiffness also you see this when cutting materials like en36 or d2 where the runout causes tool wear on one flute only it's about as usefull as using a side lock which is stiffer but has higher runout ,a better result is sometimes achieved however because your using a stiffer holder

a cutter holder like a big dai Showa will indeed give 1 micron runout if your ISO taper will have a much bigger contact taper to taper ours are at worst 4 micron at 6xd of tool

A 2mm cutter in aluminium should be spinning at somewhere near 30k even a commodity machine like a haas Vf would struggle at 5mm as the spindle tops out at around 12k which then you up the flute count to only find you need to increase feed rate

so you actually improve surface finish through the higher rpm as with a single flute cutter for aluminium CNc machines did fine with spindles that only did 4k for 20 years but then you run HSS or cobalt Carbide is really just with most small lathes pointless

we now use constant tool engagement angle to keep metal removal rates up and not worry about chip loads but I'm actually surprised anyone would bother using a 1mm doc at 2mm wide you could bastard file the job out quicker

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
EngineDIY
Eccentric July 5 2018
cowells
emcomachinetools
Warco
ChesterUK
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest