This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

Ignoramus28874 wrote:
This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

Maybe have a look here http://www.miteebite.com/ at some of the T slot
products . Can't give a direct URL as the site doesn't do that
annoyingly. Maybe the Advant-edge clamp system.

On 2010-08-16, David Billington wrote:
Ignoramus28874 wrote:
This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

Maybe have a look here http://www.miteebite.com/ at some of the T slot
products . Can't give a direct URL as the site doesn't do that
annoyingly. Maybe the Advant-edge clamp system.

Now that I thought some more about it, it is not as difficult. All I
need it to stop the program, and use a Vise-Grip to clamp the part
down to the backing, and then continue to cut it off.

i

Ignoramus28874 wrote:

On 2010-08-16, David Billington wrote:
Ignoramus28874 wrote:
This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

Maybe have a look here http://www.miteebite.com/ at some of the T slot
products . Can't give a direct URL as the site doesn't do that
annoyingly. Maybe the Advant-edge clamp system.

Now that I thought some more about it, it is not as difficult. All I
need it to stop the program, and use a Vise-Grip to clamp the part
down to the backing, and then continue to cut it off.

i

Vice-Grips are not intended as machining clamps. Try the clamp bars in
the holdown kit, they are intended for the use and will give you high
clamping pressures when used properly.

"Pete C." wrote:

Ignoramus28874 wrote:

On 2010-08-16, David Billington wrote:
Ignoramus28874 wrote:
This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

Maybe have a look here http://www.miteebite.com/ at some of the T slot
products . Can't give a direct URL as the site doesn't do that
annoyingly. Maybe the Advant-edge clamp system.

Now that I thought some more about it, it is not as difficult. All I
need it to stop the program, and use a Vise-Grip to clamp the part
down to the backing, and then continue to cut it off.

i

Vice-Grips are not intended as machining clamps. Try the clamp bars in
the holdown kit, they are intended for the use and will give you high
clamping pressures when used properly.

BTW, have you been reading the Machining Fundamentals book? It explains
various work holding scenarios including the clamp bars.

On 2010-08-16, Pete C. wrote:

"Pete C." wrote:

Ignoramus28874 wrote:

On 2010-08-16, David Billington wrote:
Ignoramus28874 wrote:
This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

Maybe have a look here http://www.miteebite.com/ at some of the T slot
products . Can't give a direct URL as the site doesn't do that
annoyingly. Maybe the Advant-edge clamp system.

Now that I thought some more about it, it is not as difficult. All I
need it to stop the program, and use a Vise-Grip to clamp the part
down to the backing, and then continue to cut it off.

i

Vice-Grips are not intended as machining clamps. Try the clamp bars in
the holdown kit, they are intended for the use and will give you high
clamping pressures when used properly.

BTW, have you been reading the Machining Fundamentals book? It explains
various work holding scenarios including the clamp bars.

I have been reading it, but not about clamps.

i

Iggy,

It really seems your zeal for CNC has surpassed your level of manual craftsmanship. Why not slow
down a bit and stop trying to digitize your entire life??

Bob Swinney
"Ignoramus28874" wrote in message
...
On 2010-08-16, David Billington wrote:
Ignoramus28874 wrote:
This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

Maybe have a look here http://www.miteebite.com/ at some of the T slot
products . Can't give a direct URL as the site doesn't do that
annoyingly. Maybe the Advant-edge clamp system.

Now that I thought some more about it, it is not as difficult. All I
need it to stop the program, and use a Vise-Grip to clamp the part
down to the backing, and then continue to cut it off.

i

On Mon, 16 Aug 2010 14:40:42 -0500, "Robert Swinney"
wrote:

Iggy,

It really seems your zeal for CNC has surpassed your level of manual craftsmanship. Why not slow
down a bit and stop trying to digitize your entire life??

What..and have him not learn what the sound of CRUNCH! SPOING!BANGRATTLE
is? Thats the sound of tooling shattering and bounching off the walls.



Bob Swinney
"Ignoramus28874" wrote in message
m...
On 2010-08-16, David Billington wrote:
Ignoramus28874 wrote:
This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

Maybe have a look here http://www.miteebite.com/ at some of the T slot
products . Can't give a direct URL as the site doesn't do that
annoyingly. Maybe the Advant-edge clamp system.

Now that I thought some more about it, it is not as difficult. All I
need it to stop the program, and use a Vise-Grip to clamp the part
down to the backing, and then continue to cut it off.

i


"A conservative who doesn't believe? in God simply doesn't pray;
a godless liberal wants no one to pray. A conservative who doesn't
like guns doesn't buy one; a liberal gun-hater wants to disarm us all.
A gay conservative has sex his own way; a gay liberal requires us all
to watch and accept his perversion and have it taught to children.
A conservative who is offended by a radio show changes the station;
an offended liberal wants it banned, prosecuted and persecuted."
Bobby XD9

On 08/16/2010 01:48 PM, Gunner Asch wrote:
On Mon, 16 Aug 2010 14:40:42 -0500, "Robert
wrote:

Iggy,

It really seems your zeal for CNC has surpassed your level of manual craftsmanship. Why not slow
down a bit and stop trying to digitize your entire life??

What..and have him not learn what the sound of CRUNCH! SPOING!BANGRATTLE
is? Thats the sound of tooling shattering and bounching off the walls.

"Bounching?"

I think one would still get that opportunity even if one already knew
manual machining techniques when one started in on CNC.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" was written for you.
See details at http://www.wescottdesign.com/actfes/actfes.html

On 2010-08-16, Gunner Asch wrote:
On Mon, 16 Aug 2010 14:40:42 -0500, "Robert Swinney"
wrote:

Iggy,

It really seems your zeal for CNC has surpassed your level of manual craftsmanship. Why not slow
down a bit and stop trying to digitize your entire life??

What..and have him not learn what the sound of CRUNCH! SPOING!BANGRATTLE
is? Thats the sound of tooling shattering and bounching off the walls.

I already broke 2 endmills in about 3 weeks of machining with this
CNC.

David Billington wrote:
Maybe have a look here http://www.miteebite.com/ at some of the T slot
products ....

Here is an easily made side clamp (scroll down to "T - Slot Fixture
Clamps"):

http://www.homemetalshopclub.org/news/may04/may04.html

Bob

Ignoramus28874 wrote:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

You would use the components from your holdown kit, T nuts, studs, clamp
bars, step blocks and flange nuts to clamp the part to the mill table.
You would write your code to perform the cuts that clear the clamps and
then stop. Then you install more clamps in the locations already milled,
and once those are secure, you remove the original clamps and then start
the remainder of the cycle to finish the machining.

http://www.use-enco.com/CGI/INSRIT?P...PARTPG=INLMK32

"Pete C." wrote:

Ignoramus28874 wrote:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

You would use the components from your holdown kit, T nuts, studs, clamp
bars, step blocks and flange nuts to clamp the part to the mill table.
You would write your code to perform the cuts that clear the clamps and
then stop. Then you install more clamps in the locations already milled,
and once those are secure, you remove the original clamps and then start
the remainder of the cycle to finish the machining.

http://www.use-enco.com/CGI/INSRIT?P...PARTPG=INLMK32

Or this one if you're ok with an unknown import set cheaper than dirt
($29 web price):

http://www.use-enco.com/CGI/INSRIT?P...PARTPG=INLMK32

I got my set from MSC some time ago on sale for $69 or so which ended up
being a TeCo set and is very nice.

On 8/16/2010 7:15 AM, Ignoramus28874 wrote:

Someone must have already invented a good scheme for doing so, any
ideas?

Really hard to offer specific advice from a vague part description. But
if the part has two parallel sides and is not too thin with respect to
it's XY dimensions, consider using thicker material and machining 5
sides. Flip over, clamping on the now machined sides, and face to
thickness.
I've always tried to use the absolute minimum amount of material
possible, but some one-off parts I'm doing right now, I decided to use
this approach as to do otherwise would require multiple setups.

If you factor the additional cost for thicker material vs the extra
labor for stopping, moving or adding/removing clamps, it can be quite a
savings. If I hadn't already faced all the parts to thickness, I'd take
a picture to show this clearly. It is btw, how a lot of production
machining is done. Hmm, but I did still have the last profile in CAD, I
just did a solids extrusion and output a GIF file. I'll email it direct.


Jon

Hmm, but I don't seem to have your email. Ping me off list, my email is
valid.


Jon

Magnetic chuck ?


On Mon, 16 Aug 2010 10:15:22 -0500, Ignoramus28874
wrote:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i

On Mon, 16 Aug 2010 12:22:40 -0400, fleetwood
wrote:



Magnetic chuck ?


Good quality double stick tape is often used for thin work.

Use a heat gun to get it to release.




On Mon, 16 Aug 2010 10:15:22 -0500, Ignoramus28874
wrote:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

I obviously cannot do it in one "start and forget" application, as at
some point the part would need to be clamped from top or something, to
avoid burs or unmachined edges.

Someone must have already invented a good scheme for doing so, any
ideas?

i


"A conservative who doesn't believe? in God simply doesn't pray;
a godless liberal wants no one to pray. A conservative who doesn't
like guns doesn't buy one; a liberal gun-hater wants to disarm us all.
A gay conservative has sex his own way; a gay liberal requires us all
to watch and accept his perversion and have it taught to children.
A conservative who is offended by a radio show changes the station;
an offended liberal wants it banned, prosecuted and persecuted."
Bobby XD9

What's that Lassie? You say that Ignoramus28874 fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Mon, 16 Aug 2010 10:15:22 -0500:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

If its really flat, you can use a vacuum fixture, and machine 5 sides,
and if you know the trick, even drill holes through.

--

Dan H.
northshore MA.

On 2010-08-17, dan wrote:
What's that Lassie? You say that Ignoramus28874 fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Mon, 16 Aug 2010 10:15:22 -0500:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

If its really flat, you can use a vacuum fixture, and machine 5 sides,
and if you know the trick, even drill holes through.


These two should work well for what I want.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=130421610161

i

Ignoramus28874 wrote:

On 2010-08-17, dan wrote:
What's that Lassie? You say that Ignoramus28874 fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Mon, 16 Aug 2010 10:15:22 -0500:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

If its really flat, you can use a vacuum fixture, and machine 5 sides,
and if you know the trick, even drill holes through.


These two should work well for what I want.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=130421610161

i

shaking head

Here, look at this: http://www.sherline.com/3013inst.htm

On Mon, 16 Aug 2010 21:17:02 -0500, "Pete C."
wrote:


Ignoramus28874 wrote:

On 2010-08-17, dan wrote:
What's that Lassie? You say that Ignoramus28874 fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Mon, 16 Aug 2010 10:15:22 -0500:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

If its really flat, you can use a vacuum fixture, and machine 5 sides,
and if you know the trick, even drill holes through.


These two should work well for what I want.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=130421610161

i

shaking head

Here, look at this: http://www.sherline.com/3013inst.htm

If Iggy needs some of Petes Most Excellent hints..I have a few extras I
can send him. Least I have plenty of the steps....

Iggy really needs to learn a bit more...doesnt he?

Gunner


"A conservative who doesn't believe? in God simply doesn't pray;
a godless liberal wants no one to pray. A conservative who doesn't
like guns doesn't buy one; a liberal gun-hater wants to disarm us all.
A gay conservative has sex his own way; a gay liberal requires us all
to watch and accept his perversion and have it taught to children.
A conservative who is offended by a radio show changes the station;
an offended liberal wants it banned, prosecuted and persecuted."
Bobby XD9

On 2010-08-17, Ignoramus28874 wrote:
On 2010-08-17, dan wrote:
What's that Lassie? You say that Ignoramus28874 fell down the old
rec.crafts.metalworking mine and will die if we don't mount a rescue
by Mon, 16 Aug 2010 10:15:22 -0500:

This is actually a practical application, as someone said he may want
me to do a parts run for him.

Let's say that out of a flat stock, I want to cut out a part and it
needs to be beveled on all sides.

If its really flat, you can use a vacuum fixture, and machine 5 sides,
and if you know the trick, even drill holes through.


These two should work well for what I want.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=130421610161

They will do for onesy-twosy operations -- though I would
consider three to be better, so you could clamp in a third spot before
releasing the first -- less chance of the workpiece shifting -- rotating
around the sole remaining clamp pressure point.

But if you are doing a lot of something, I would suggest the
De-Sta-Co toggle clamps.

Drop into the MSC page (or catalog) and look at item 3
#65189706 -- with a soft pad to avoid marring. They are also available
with simply the slotted bar which you can put a bolt into -- and perhaps
polish the head a bit first if you want a heavier grip. This one is a
1000 lb clamp capacity for $21.07 each. Others are down to 600 lb
capacity -- or much less for really small ones.

Anyway -- when you operate the lever, the clamping bar lifts 90
degrees as the handle pivots out of the way.

There are other versions which push horizontally -- to hold the
workpiece against a stop on the table to start in the proper position.

Anyway -- they are very quick to operate to move the one out of
the area about to be machined and to lower another into the area already
machined.

To see the whole collection -- at least one other brand besides
De-Sta-Co -- just search on "Toggle Clamp". At least the first page
does not show anything which does not belong -- unlike with many
searches on their site.

Of course, you can find them on eBay -- or in one of your usual
lucky find areas.

Enjoy,
DoN.

--
Remove oil spill source from e-mail
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---