Fill in my knowledge gap :)

[lucan07]

Yes only cut the slot and contour once then flip to machine only what could not be machined from front, so back would just be a T shaped pocket to required depth. I would start from same corner point on second setup but on other side of material obviously. Although placement may be easier to cut slot and T Pocket and holes first and then flip to cut remaining front using holes and pockets to fix back down.

[Davek0974]

The slot is pretty wide so i would position the material to place the eventual slot over a run of bed holes, machine the slot plus the two small ovals, then fit clamps into the slot and finish the rest of the front.

As you said, then place blocks on bed touching the finished edge, flip over, clamp around the edge and machine the pocket T.

Seems to make sense now, will finish the drawings and do a simulation or two :)

Thanks

[Davek0974]

A little more gap to fill...

How do you program an edge chamfer or break an edge in CNC??

I have Aspire but no idea on this one?

I would guess at using a 45deg tool but is there a method to offset the correct amount and set the depth?

[JAZZCNC]

A little more gap to fill...

How do you program an edge chamfer or break an edge in CNC??

I have Aspire but no idea on this one?

I would guess at using a 45deg tool but is there a method to offset the correct amount and set the depth?

The Cam software will most likely have Chamfer toolpath which will give parameters such as chamfer length then take the tool size/angle and do the offset for you.

If not then it's bit of math for depth/length which I've no clue about and setting an offset. To save my brain I just use Cad to show me how deep/offset etc.

[needleworks]

A little more gap to fill...

How do you program an edge chamfer or break an edge in CNC??

I have Aspire but no idea on this one?

I would guess at using a 45deg tool but is there a method to offset the correct amount and set the depth?

I am no expert by any stretch of the imagination, and I also struggled with this one ! What I ended up doing was just a case of simple maths, taking your 45deg cutter, You could assume that 0, 0, 0, puts the tip of the cutter right on the edge of your part, I then just told mach3 that I was using a 4mm cutter (doesn`t matter what size you insert here as long as it corresponds with your depth of cut) and used a cutting depth of 2.5mm. This in turn would put a .5 chamfer (in my case just a regular countersink) right round the edge of your part. If you required a larger chamfer, then simply lower the cutter to a depth of 3mm. Hope you can understand what I`m trying to say here

[lucan07]

Only do this in Fusion but just use a 2d chamfer and select a chamfer mill to suit.

[Davek0974]

Thanks all, seems this function is a downloadable option for Aspire but as I'm running an older version of the software it's not available for me, oh well, looks like i'll be needing that math knowledge I didn't learn at school again....


:)

Yes the explanations make sense and I have an idea now of what to try.

[routercnc]

Hi Dave,

Just knocked this together to help work it out.

You can use one of the 3 look up tables depending on if the chamfer tool is 90, 60, or 45 deg.

Then assuming you use a notional tool diameter of 4mm as suggested above by needleworks in the CAM tool definition, then you just need to look up the required chamfer distance you require (C) and read off the depth of cut required (P) and enter this value into the CAM software.

I've not tried this out but I think it is OK. Please check on a scrap piece first (!).

Any errors spotted by anyone let me know . . .

[needleworks]

Hi Dave,

Just knocked this together to help work it out.

You can use one of the 3 look up tables depending on if the chamfer tool is 90, 60, or 45 deg.

Then assuming you use a notional tool diameter of 4mm as suggested above by needleworks in the CAM tool definition, then you just need to look up the required chamfer distance you require (C) and read off the depth of cut required (P) and enter this value into the CAM software.

I've not tried this out but I think it is OK. Please check on a scrap piece first (!).

Any errors spotted by anyone let me know . . .

Yes, that explains it a lot clearer mate I should also have said that I use cambam for my toolpaths (not mach3 as I said in my previous post) like many, I just can`t get to grips with fusion 360 cause it always seems to mess up somewhere.

[Boyan Silyavski]

Hi Dave,

Just knocked this together to help work it out.

You can use one of the 3 look up tables depending on if the chamfer tool is 90, 60, or 45 deg.

Then assuming you use a notional tool diameter of 4mm as suggested above by needleworks in the CAM tool definition, then you just need to look up the required chamfer distance you require (C) and read off the depth of cut required (P) and enter this value into the CAM software.

I've not tried this out but I think it is OK. Please check on a scrap piece first (!).

Any errors spotted by anyone let me know . . .

While we are here. Just in tune with your calculations /that i will have to save somewhere/ - i needed a couple of times to calculate a V cutter flute length /FL/. Reason was i have V cutters that cut deeper than their flutes, a mix between V cutter and spiral flute mill, where the flute ends at shank width. Wow, it took me some time to figure how to calc these so i could draw them properly in program. Properly means exactly without any errors.

I read here how to calculate the flute length Link,
the formula for sides of Isosceles Triangle, so i came up with FL=((shank diam - tip diameter)/2)/cos((180-vertex angle)/2)