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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 95 96 97 98 99 100 101 102 Next > Last >>
Thread: Milling - difficult to gauge exact cut
29/01/2012 10:32:06
one additional thing..if making forks ..some times best to leave a frame at open end of part..then remove later..this will stiffen you part until milling finished... But if question is "why doesn't my cut go where I setup.." well sorry , thats life, machines,cutters,and work all flex. All the above advice good for setup. Also lock any axis not travelling..nothing fixes backlash like a lock.
Thread: Vernier vs Micrometer
26/01/2012 22:51:16
Ok.
I use digital mic day in day out for diameters(+/-0.001). I use CALIPIERS for depths shoulders and lengths (+/- 0.01)
The one thing I practically never use is a vernier.
Have had to , could probably dredge up how to , but confident?
No..
funny thing is;
mic has vernier but calipier doesn't.

Thread: Manky External Threads
25/01/2012 21:15:36
Had simular .
maybe over size "rod". m6 od is not 6.0 for example....

Thread: Lathe turns convex
25/01/2012 21:09:08
sorry if off topic.
BUT this thing about the cross slide "out of true"
Heard it else where. never seen it at work (CNC'S)
. Is it a manual thing?
Thread: What is case hardening?
24/01/2012 21:57:53
thanks .
Michael..I hadn't heard of heat treating post hardening myself..but when writing considered the possibility. Wolfie the is another thread going on homebrew caseharding compound..I can't post link here to it maybe MW can.
Thread: SS Great Britain
24/01/2012 21:47:20
loved the wavely too.
Particularly low speed..feels like lots of little feet shuffling round.
Thread: Silver Soldering
24/01/2012 21:39:41
Wish I still had my swiss welding kit.
Used to butt weld copper wire 0.3mm to 4mm ..no flux no fillet. Still couldn't joint stainless to copper without solder but would surely have been a handy torch ..cheap too just water and electric...
Thread: What is case hardening?
24/01/2012 21:25:10
in short no.
Carbon steels can be hardened by heating then quenching.
Tempering reduces that final "glass" hard state to something less hard more resiliant..the trade off determines the temper .
Ok now try this with mild steel..no joy.
To make the surface layer of the mild steel hard and tough case hardening heats the steel in a carbon rich envionment and forms a layer of higher carbon steel on the outside.
You might ask if this layer can be hardened and tempered in itself...never heard of it . Anyone?
Thread: Making your own case hardening compound.
24/01/2012 19:33:00
..urea...etc.
This like any protein will produce ammonia on heating..less nitriding more a reducing atmoshere..might also keep carbon as carbon not as carbon monoide and carbon dioxide thus you should get carbon as vapour and no iron oxide (even brightening metal further)...
Btw japaneses swords are case hardened by adding rice straw between layers..then beating out and folding again...carbon folded into metal in very thin layers...7 folds means 128 layers...working at 1/2" would yield layers 4 thou or 100 mirons
Thread: Silver Solder Identification
21/01/2012 21:36:20
know any engineer shop locally who can "xray" it for you? Or maybe a scrappy they oftern was xray guns.. (xray...xray fluoresence)
Thread: Wire and plate gauges
21/01/2012 21:26:20
in short its not linear..ie: 50swg =1 thou. But 25 swg is not 2 thou
21/01/2012 20:37:20
google 'standard wire gauge' the wikipeedia article is pretty good.

21/01/2012 20:21:22
gauge is still used all over , in tube wall for instance... Just get used to odd hang overs from our illustrious past...apparently the railway gauge is the same as the roman chariot/ standard wheel width .yes they had that level of standardisation..
I seem to remember swg is related to how long a wire per unit weight...
Thread: Drilling Vise improvements question
21/01/2012 16:23:16
just thought.
If you are remaking clamp screw..you can choose a thread you have gear to make.. 'just ' bore out existing tnread and start again...maybe with bush tapped to size to suit..finer threads give greater grip but are more likely to strip under load......multi start threads anyone?
Thread: flatness of faceplate ?
21/01/2012 15:43:11
futher to the sacrificial face plate...have heard of using old brake discs ...obviously mounted on other faceplate.
Thread: Finding the centre again
21/01/2012 10:42:29
"hold original IN vise"
21/01/2012 10:41:14
Ok. Not withstanding how usefull knowing the dimentions would be.
If all you want is to copy a part .
Assume new plate is same size. And you have acces to milling mc or drill press.
Hold original vise
Chuck drill blunt end out
Or better yet drill blank all of same size of original hole
Now position rod/drill in hole. Clamp up part. Clamp down vise.
Recheck drill still fits hole
Remove part replace with new piece. Chuck drill say pilot drill
Drill pilot hole ....etc.
20/01/2012 20:57:19
sorry about typos
20/01/2012 20:56:38
lets assume the part is rectangular
to measure define a hole measure te wall from hole to each edge.
measure diameter of hole.
the centre is those "wall" measurements plus half the diameter.
thus id dia. is 10
and wall at top is 12 center will be 17 from top
simularly for othee directions.
sorry if stating the obvious

 
20/01/2012 20:36:03
ok as to 'finding center of existing marked circle' as apposed to copying holes.
Might be fiddly at this scale but the center finder used for bar ends will work. See use in tool clamp project mew186
As would marking arcs from four points on the circle.
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