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

Member postings for jason udall

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

<< First < Prev 35 36 37 38 39 40 41 42 43 44 45 Next > Last >>
Thread: Square hole
13/05/2014 22:23:59
Rota broach is how ( well one way) that hex holes etc can be put in the end of bolts...forging is also used but...
13/05/2014 22:21:40
There are drill systems to do this..but...
How deep?
Blind?
How big?
If not blind..drill corners..drill center then broach...
Or rota broach

Thread: Perfectly ground Twist Drills every time.
13/05/2014 22:16:32
But then those pcb drills are sub 0.3 mm so might be tricky to grind..just wondering
13/05/2014 22:14:45
Ah Chris..so it is superior. .A easier to generate. .B stronger..
And further study shows that the intended "face" is two faces each part of a cone........
Well I can make ( just) the spear point work..but am still looking into the geometry. .btw how does the flute helix effect setting..some of my carbide drills have faster than "normal" helix..and some pcb drills have slower helix. .slow =less turns per inch
13/05/2014 18:22:53
Gray
.If you could. .and even if you feel like doing by pm
Rather than here
Test grind a plane rod ..ie no flutes. .and post a photo of the sharp end.

.I am trying to "understand"..
It seems to me that the jig will grind two cylindrical faces on the end ..and the flute combined generates the cutting face..
The only way I can grind is what I call four facet..more like a spear point drill..than the conventional bought in result....
Is the reason for the cylindrical face a production compromise ...or is there an advantage?
Regards Jason
Thread: Closed thread
13/05/2014 14:28:21
Maybe it would help if we adopted tribal avatars...team edward or whatever....
Thread: Perfectly ground Twist Drills every time.
13/05/2014 14:23:53
Would someone please let me know whem this thread gets back on topic
12/05/2014 12:41:04

OK.

I for one am excellent at shortening drills.

Freehand= hopeless.

In the production (cnc) envionment I have met adequate drill shapeners on free hand.

I have found unused drill jigs on shelves..."too slow"..

these drill typically drilling 5mm x100mm..holes with.0,05 mm concentrity and runout.and +/- 0.075 mm on dia

this with a 2 minute cycle time in en16t iq...

now if a drill is less than optimally ground it will wander and/or drill big [even seen small...? how i don't know]

so if hole not right then grind it again..

As I say drill jigs unused...

Can I freehand sharpen drills? ....not a chance... with a good jig..less than great..

So i read this thread with intrest...I might learn something

Btw in the above job...sharpen interval...300 parts...because thats a shift, tests show 450-600 before failure..[drill break]

Thread: Helping young people
09/05/2014 20:33:11
To the op..best of luck.

I have read in trade papers that companies have/are avoiding employing under 18's..because they MIGHT have to put all staff/suppliers /carriers that MIGHT come in contact with the young person on a child protection course and carry out a criminal records buero check on such persons...
Now I use the word MIGHT. ..since they could not get "opinion" to definitively say if they did or didn't.
Thus..well the result is under 18's are becoming unemployable. ..

Edited By jason udall on 09/05/2014 20:34:06

Thread: Machining Bevel Gears
04/05/2014 20:51:37
Thanks
04/05/2014 19:23:41
Can one of the cognisant. .tell me how a bevel gear works...I mean you have two dissimilar diameters and the same module or DP...
And the same tooth count on each end...
Thinking of the bevel gear as a stack of infinity thin spur gears ...doesn'thelp. ...
Thread: What is this fourth (threaded) hole in the die stock holder ?
04/05/2014 19:16:55
Re grub screws...
No none ....apart from neatness..
But with you on the thin wall...but then it does save manufacturing cost..
Thread: Can low pressure steam boilers be soft soldered ?
28/04/2014 13:01:15
Oh and in our modern world..lead free solder would be "required" stuff...so again are designs intended for that jointing material.and any?difference?in material properties. ..
28/04/2014 12:57:10
A couple of things.

Soft solder is a lower temperature process. .and as such anything fabricated thus will have a lower working temperature. .and consequently pressure...

Also joints are in soft soldering generaly not considered mechanical..so you build should hold together before soldering...this seems counter to practice in silver soldering.
So for low pressure and designs intended to be soft soldered "only"...
Thread: Silver steel with roller bearings.
21/04/2014 12:23:48
Just in case I have missed something..The roller race does or doesn't have an inner?
Because if it does then all you are doing is bushing it to suit the linkage bolt?...in which case almost any steel would suffice..
But if the rollers will act on your "bush" directly then that's a horse of a different colour..
If just a bush and not in effect the inner of a race then make a fit on inner of race ( even use bearing /bush lock glue )..
Thread: Nippy vice upper jaw plate problem
18/04/2014 17:18:04
Soft jaws?
Thread: Slip Gauge
16/04/2014 22:35:52
Further to john s ..
I once worked at a mod research establishment. ..in any case a rep from a tool supply company called on the head of the workshop. ..
Amongst other things pushed was the newest ultra small drills...of the size to drill holes down hair...
Nothing smaller brags rep...
Sample me on them then....

After a while the samples were posted back to rep...with holes drilled ...made them look like a penny whistle......
Thread: What I did today
13/04/2014 12:19:57
Roger I am sure you are aware of all the hazards in the above setup.

Few would be...but ...those who might follow your lead might be less well informed...

MadameCurie messed about with chemical radium pretty much all her life..yet voluntary work with one of those tubes during WW1 is probably the cause of the cancers that killed her at if I remember a venerable age.
..
I can see in that setup other things that would worry me first..before the X rays ..flying glass for one....but your workshop your risk..and good on you.

Edited By jason udall on 13/04/2014 12:20:41

Thread: Reader Survey
12/04/2014 09:49:48
John S..not for the first time I have come to the conclusion that you are a wit...at least I think that thats how its spelt
Thread: What I did today
11/04/2014 13:14:26
Nice conversion. .ceramic bearings eh.....
Does it have the speed/torque..seem to remember these things are stallable..might even be an advantage....
<< First < Prev 35 36 37 38 39 40 41 42 43 44 45 Next > Last >>
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

Sign up to our Newsletter

Sign up to our newsletter and get a free digital issue.

You can unsubscribe at anytime. View our privacy policy at www.mortons.co.uk/privacy

Latest Forum Posts
Support Our Partners
cowells
Sarik
MERIDIENNE EXHIBITIONS LTD
Shopping Partners
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

 

Donate

donate