making a jig
making a jig
hello
i want to create a jig as follows: (see attachment)
using a 1/8 end mill, i will cut inside the line to remove the material from inside each rectangle. this will leave rounded corners in each rectangle.
using the same pattern as above (from a second piece of material)i will cut outside the line on the same rectangles to create blocks which will then be inserted into the jig for machining. cutting on the outside will leave square corners. when i attempt to insert the blocks into the jig, they will not fit as the hole has rounded corners.
how do i fix this?
i want to create a jig as follows: (see attachment)
using a 1/8 end mill, i will cut inside the line to remove the material from inside each rectangle. this will leave rounded corners in each rectangle.
using the same pattern as above (from a second piece of material)i will cut outside the line on the same rectangles to create blocks which will then be inserted into the jig for machining. cutting on the outside will leave square corners. when i attempt to insert the blocks into the jig, they will not fit as the hole has rounded corners.
how do i fix this?
- Attachments
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- jig.pdf
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- Vectric Craftsman
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Re: making a jig
Does your software have a tool for creating a dogbone fillet? If not, you can add some circles on the corners larger than your bit diameter and create a larger circular corner.
Charlie
Aspire, CAMaster Stinger II
Aspire, CAMaster Stinger II
- dealguy11
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Re: making a jig
Either a t-bone or dog bone fillet on the corners will solve the problem. I usually use t-bone for this, but it doesn't really matter. Make sure the radius of the fillet is 1/16" or larger (i.e., at least the radius of the end mill)
Steve Godding
Not all who wander (or wonder) are lost
Not all who wander (or wonder) are lost
- martin54
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Re: making a jig
Do the blocks have to have square corners? If rounded corners would work ok on your blocks then you can use the inlay loolpath to create both the male & female parts, the inlay toolpath is designed to overcome this sort of problem.
If the blocks need to have square corners then use fillets as has already been said.
For my jigs where square internal corners are required I just took the corners out with a chisel I could have used fillets but it's not a big job to take them out by hand if you use a small bit for the profile
If the blocks need to have square corners then use fillets as has already been said.
For my jigs where square internal corners are required I just took the corners out with a chisel I could have used fillets but it's not a big job to take them out by hand if you use a small bit for the profile
Re: making a jig
thank you all!!!
the dogbone filet is doing the trick.
the dogbone filet is doing the trick.
Re: making a jig
woke up in the middle of the night thinking about the bench tutorial.
at one point, it is suggested to make dogbone filet for the mortise on the seat so as to deal with the "rounded corners" issue.
when the tenon is pushed into the mortise, won't the rounded corners leave a gap between the tenon and mortise at each corner?
at one point, it is suggested to make dogbone filet for the mortise on the seat so as to deal with the "rounded corners" issue.
when the tenon is pushed into the mortise, won't the rounded corners leave a gap between the tenon and mortise at each corner?
- dealguy11
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Re: making a jig
If you're just looking to make a jig, then that space doesn't matter.
Steve Godding
Not all who wander (or wonder) are lost
Not all who wander (or wonder) are lost
Re: making a jig
absolutely!
but what if i were making the bench in the demo....
but what if i were making the bench in the demo....
- Adrian
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Re: making a jig
That's just the way it is with a round tool. If you want to do everything on the CNC then you have to have a dogbone or cut everything with radii to match which isn't always possible.
As said earlier in the thread sometimes a simple chisel is the best solution.
- martin54
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Re: making a jig
For me the CNC is just another piece of machinery in the workshop, lots of jobs are still quicker/easier to do with other tools, don't fall into the trap of trying to do everything with the CNC, it's an easy trap to fall into when you first get a machine
- TReischl
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Re: making a jig
Who says a tenon has to have a square corner anyhow?
I cut mine on the front of the machine with the piece standing vertically. The worksurface on the machine is 39 inches from the floor. So I can cut pretty much any tenon I need to. BTW, I love doing it this way. Once the tenon is dialed in (yanno, tool bit diameter, etc) I can cut perfect fitting tenons all day. Since it is side cutting the cuts are really nice.
And, failing that! Round the corners over with a file. Who'd a thunk?
Pays to avoid the ol' "When all you have is a hammer everything looks like a nail" syndrome.
Edit: Martin already said that!!!!
I cut mine on the front of the machine with the piece standing vertically. The worksurface on the machine is 39 inches from the floor. So I can cut pretty much any tenon I need to. BTW, I love doing it this way. Once the tenon is dialed in (yanno, tool bit diameter, etc) I can cut perfect fitting tenons all day. Since it is side cutting the cuts are really nice.
And, failing that! Round the corners over with a file. Who'd a thunk?
Pays to avoid the ol' "When all you have is a hammer everything looks like a nail" syndrome.
Edit: Martin already said that!!!!
"If you see a good fight, get in it." Dr. Vernon Johns
Re: making a jig
i was actually thinking the same thing. cut at the vertical!
- TReischl
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Re: making a jig
Here is a link to my YouTube video showing the fixture I use:
https://youtu.be/NhLkB1ZyOPo
Cutting finger joints in the video, but it is the same principal. Tenons are easier.
There is quite a bit of air cutting in the video because I was rolling the tool around the corners of the tenons to prevent chipout, that is what those first two cuts are doing, getting rid of material that could chip out.
https://youtu.be/NhLkB1ZyOPo
Cutting finger joints in the video, but it is the same principal. Tenons are easier.
There is quite a bit of air cutting in the video because I was rolling the tool around the corners of the tenons to prevent chipout, that is what those first two cuts are doing, getting rid of material that could chip out.
"If you see a good fight, get in it." Dr. Vernon Johns
- scotttarnor
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Re: making a jig
TReischl, Nice video have to remember the first cuts to prevent blow out
You scared me with the collet getting close to the material in the final pass.
You scared me with the collet getting close to the material in the final pass.
Scott T
@scottscnc
@scottscnc