Made something useful at last

Advert

New Replies

Report Bug

Help/FAQs

Made something useful at last

This topic has 22 replies, 14 voices, and was last updated 7 November 2017 at 21:17 by MW.

Viewing 23 posts - 1 through 23 (of 23 total)

Author

Posts
5 November 2017 at 16:36 #31186
sean logie
Participant
@seanlogie69385
Advert

5 November 2017 at 16:36 #325599
sean logie
Participant
@seanlogie69385
Made myself a wee vee block and I'm planning a couple more out of the same piece of material . I also learned how important setting up a work piece up before machining . Also used a carbide end mill for the first time today (very impressive ) . I cut the square channel on the side using a 4 flute ,is this good practice or should I have used a 2/3 flute . Overall I'm happy with the end result . The Centec2 keeps on impressing ,I was taking what I thought were big cuts for this small mill ,the only thing stopping taking bigger cuts was the operator .

Getting a tad impatient now to get the vertical up and running .

Don't know why my photos are always like this on here ….

Sean

Edited By Neil Wyatt on 07/11/2017 15:23:54
5 November 2017 at 16:44 #325601
Trevor Drabble 1
Participant
@trevordrabble1
Sean , Nice work . May I suggest you now put a nominal 3mm x 3mm slot along the full length of the bottom of the Vee in order to allow dirt and dwarf somewhere to go and also to allow any angular work to sit fully on the sides of the Vee , and so maintain an accurate register . Trevor
5 November 2017 at 16:44 #325602
Russell Eberhardt
Participant
@russelleberhardt48058
Posted by sean logie on 05/11/2017 16:36:29:

Don't know why my photos are always like this on here ….

See this thread.

Russell
5 November 2017 at 16:48 #325603
John Haine
Participant
@johnhaine32865
Good stuff! When you make 2 more try machining as a pair so that they match – useful then for holding longer bars needing support at both ends.
5 November 2017 at 17:24 #325610
sean logie
Participant
@seanlogie69385
Posted by Trevor Drabble on 05/11/2017 16:44:27:

Sean , Nice work . May I suggest you now put a nominal 3mm x 3mm slot along the full length of the bottom of the Vee in order to allow dirt and dwarf somewhere to go and also to allow any angular work to sit fully on the sides of the Vee , and so maintain an accurate register . Trevor

Thanks Trevor ,

That was my next move along with a slitting saw cut along the bottom of the vee .

Sean
5 November 2017 at 17:26 #325611
sean logie
Participant
@seanlogie69385
Posted by John Haine on 05/11/2017 16:48:04:

Good stuff! When you make 2 more try machining as a pair so that they match – useful then for holding longer bars needing support at both ends.

Hi John ,

I've enough material to make another two which as you suggested will be a pair .

Sean
6 November 2017 at 19:48 #325801
David George 1
Participant
@davidgeorge1
Hi Sean

I would also put a couple of taped holes in the base of the V block as it gives you the option to screw them to a plate or an angle plate and a taped hole in the end face so you can screw a plate to the end as an end stop for a pin or round part.

David
6 November 2017 at 20:30 #325808
Rainbows
Participant
@rainbows
Speaking of pairs feel free to make two vertical heads and send me one
6 November 2017 at 21:25 #325817
sean logie
Participant
@seanlogie69385
Rainbows no probs ….

Sean
6 November 2017 at 22:40 #325826
John Reese
Participant
@johnreese12848
Posted by Trevor Drabble on 05/11/2017 16:44:27:

Sean , Nice work . May I suggest you now put a nominal 3mm x 3mm slot along the full length of the bottom of the Vee in order to allow dirt and dwarf somewhere to go and also to allow any angular work to sit fully on the sides of the Vee , and so maintain an accurate register . Trevor

I believe the slot at the bottom of the V is to allow grinding withe the need for sidewheeling. Unless he intends to grind the blocks there is no advantage to the undercut.
7 November 2017 at 07:35 #325832
not done it yet
Participant
@notdoneityet
there is no advantage to the undercut.

Unless wanting to mount a square item to machine on one corner…
7 November 2017 at 08:05 #325835
Michael Gilligan
Participant
@michaelgilligan61133
Posted by not done it yet on 07/11/2017 07:35:18:

there is no advantage to the undercut.

Unless wanting to mount a square item to machine on one corner…

.

I was so tempted to get all pedantic … but I shall refrain.

Yes; in practical terms that is a very fair point.

MichaelG.
7 November 2017 at 08:07 #325836
sean logie
Participant
@seanlogie69385
Please don’t refrain 😉

Sean
7 November 2017 at 09:39 #325851
Martin King 2
Participant
@martinking2
Posted by sean logie on 07/11/2017 08:07:42:
Please don't refrain 😉

Sean

Seconded!

Pedantry from a master is so much fun!

Martin
7 November 2017 at 13:15 #325873
Michael Gilligan
Participant
@michaelgilligan61133
Apologies for the delayed response, Sean [and Martin], I made that post just before heading to the Hospital for my pacemaker check. … All is well, so here goes:

'ndiy' has not defined any terms, nor given any tolerances; so we are obliged to make some assumptions: Mine [which I hope are considered reasonable] would be …
1. A vee block has two internal faces which are flat, and arranged at 90° to each other, and are axially parallel. [More sophisticated definitions are surely possible, but I think that will suffice]
2. In the context of the present discussion; 'a square item' might be assumed to be a length of material of constant section with four equal sides arranged at 90° increments.
3. … Alternatively the 'square item' might only have two of its adjacent faces arranged at 90° to each other; the emphasis being on 'squareness' as a description of perpendicularity.
4. My case is valid for both version (2.) and (3.)
5. In the absence of any tolerances being stated, we must in the ideal case assume 'perfection'.
Unfortunately, in this hypothetical 'defining case' ndiy's brief assertion falls down … because the 'square corners' would match perfectly and the groove would therefore NOT be of any advantage.

^^^ This is, of course, merely gratuious pedantry !!

In the real world; ndiy's point is a good one … because the 'male' square corner may have bruises [or imperfections in its linearity] sufficient to cause it not to seat properly in the 'perfect' female vee.

N.B. Many other imperfections are available …

MichaelG.
7 November 2017 at 13:25 #325876
David Standing 1
Participant
@davidstanding1
Posted by Michael Gilligan on 07/11/2017 13:15:16:

Apologies for the delayed response, Sean [and Martin], I made that post just before heading to the Hospital for my pacemaker check. … All is well, so here goes:

'ndiy' has not defined any terms, nor given any tolerances; so we are obliged to make some assumptions: Mine [which I hope are considered reasonable] would be …
1. A vee block has two internal faces which are flat, and arranged at 90° to each other, and are axially parallel. [More sophisticated definitions are surely possible, but I think that will suffice]
2. In the context of the present discussion; 'a square item' might be assumed to be a length of material of constant section with four equal sides arranged at 90° increments.
3. … Alternatively the 'square item' might only have two of its adjacent faces arranged at 90° to each other; the emphasis being on 'squareness' as a description of perpendicularity.
4. My case is valid for both version (2.) and (3.)
5. In the absence of any tolerances being stated, we must in the ideal case assume 'perfection'.
Unfortunately, in this hypothetical 'defining case' ndiy's brief assertion falls down … because the 'square corners' would match perfectly and the groove would therefore NOT be of any advantage.

^^^ This is, of course, merely gratuious pedantry !!

In the real world; ndiy's point is a good one … because the 'male' square corner may have bruises [or imperfections in its linearity] sufficient to cause it not to seat properly in the 'perfect' female vee.

N.B. Many other imperfections are available …

MichaelG.
You didn't disappoint
7 November 2017 at 14:16 #325878
sean logie
Participant
@seanlogie69385
Now that’s a reply …. I wonder if there will be any response …. dam I wish I’d stuck in more at school … you had me chuckling away to myself ….

Sean
7 November 2017 at 14:43 #325882
Jim Cahill
Participant
@jimcahill55556
Hello Sean,

In one of his books, Geo. H. Thomas goes to some length to explain why he believes 4 flute cutters (Known as End Mills in the UK) are inclined to break as they emerge from cutting a channel.
7 November 2017 at 15:07 #325883
sean logie
Participant
@seanlogie69385
Makes sense Jim , coming out the end of the cut was when the end mill groaned a bit . Should I be using a 2/3 flute for cutting channels .

Sean
7 November 2017 at 16:29 #325888
MW
Participant
@mw27036
Very nice, do you think you'll polish them with emery cloth when you're finished or will you leave them to a machine finish?

Michael W
7 November 2017 at 19:38 #325909
JasonB
Moderator
@jasonb
The slot in the base of the Vee will also clear any burrs on "square" stock and help it sit level, much the same as the notch on a tri-square
7 November 2017 at 21:17 #325919
MW
Participant
@mw27036
Posted by JasonB on 07/11/2017 19:38:14:

The slot in the base of the Vee will also clear any burrs on "square" stock and help it sit level, much the same as the notch on a tri-square

As we know, all unmachined stock will have a corner radius that would foul the bottom of the vee. the only thing is with square stock, you would need a special kind of vee clamp screw rather than the standard screw clamp in order to hold it properly.

One other thing it's useful for is that you can stack a couple of vee blocks to get a nice 45 degree for marking out stock.

Michael W

Edited By Michael-w on 07/11/2017 21:25:23
Author

Posts