material left in between cut out parts left is it enough or safe?

Post Reply
sebashtionh
Vectric Apprentice
Posts: 62
Joined: Wed Oct 28, 2015 6:09 am
Model of CNC Machine: pilot pro 50x104
Location: Florida
Contact:

material left in between cut out parts left is it enough or safe?

Post by sebashtionh »

Hello,
I hope this is the correct thread to ask this.
I am laying out parts on a 4x8 sheet and need to know how much material is safe or able to still hold the parts.
5hp spindle
1/4 compression bit form Amana.
110ipm 50in plunge with ramp
I am cutting 4x8 sheets of 1/2 plywood
I am not using a vacuum table
I am looking at using a composite nailer to hold the ply flat to the spoil board but it will be nailed in the 1/4 in waste left after cutting out the parts.
is 1/4 in of material left in between the parts enough to hold the tabs and parts together ?

User avatar
FabLab Wageningen
Vectric Craftsman
Posts: 236
Joined: Mon May 09, 2022 8:17 pm
Model of CNC Machine: Ooznest Workbee 1500x1500
Location: Wageningen, Netherlands
Contact:

Re: material left in between cut out parts left is it enough or safe?

Post by FabLab Wageningen »

1/4 inch ? That's 6.something mm in my metric mind.

I use generally a larger area / distance between parts. Normally, I would use minimally about 2 bit diameters, so in this case 1/2 inch. I may be too carefull, though. But better safe than sorry. No idea whether there are best practices for this. So: good question.

I know hat some commercial firms require 15 to 20 mm (er, sorry: 6/10 to 8/10 inch) spacing between parts.

Marcel.

User avatar
adze_cnc
Vectric Wizard
Posts: 4636
Joined: Sat Jul 27, 2013 10:08 pm
Model of CNC Machine: AXYZ 4008
Location: Vancouver, BC, Canada

Re: material left in between cut out parts left is it enough or safe?

Post by adze_cnc »

Marcel: 1/4" is 6.35mm is 1/4" to my dual-units-of-measure Canadian brain... 8)

Original poster: when you say 1/4" material left between do you mean that from the edge of one part to the edge of a second part you have: 1/4" kerf for the bit, 1/4" material, 1/4" kerf for the bit for a total of 3/4" between parts.

I've often had only one bit width between parts (students being notoriously frugal) and it can work out fine. You just have to place tabs for each part to be coincident with parts of another part.

If you have 3/4" as mentioned above that can work too. Just be generous with your tabs on very long straight runs to prevent vibration of the 1/4" strip between parts.

Tailmaker
Vectric Wizard
Posts: 741
Joined: Sun Jun 16, 2013 4:40 am
Model of CNC Machine: Home Built 4-axis Router
Location: Fort Collins, CO

Re: material left in between cut out parts left is it enough or safe?

Post by Tailmaker »

Hmm. If you want to nail into the narrow waste strip, you may have to run a shallow marking path of your outlines first. Or how will you know where to nail?
But even if you have only 1/4" as minimum waste width, you may find wider areas as long as your lines are not all straight.
Dovetail and Finger Joint, Puzzle, Maze and Guilloche freeware at fabrikisto.com/tailmaker-software

User avatar
FabLab Wageningen
Vectric Craftsman
Posts: 236
Joined: Mon May 09, 2022 8:17 pm
Model of CNC Machine: Ooznest Workbee 1500x1500
Location: Wageningen, Netherlands
Contact:

Re: material left in between cut out parts left is it enough or safe?

Post by FabLab Wageningen »

adze_cnc wrote:
Fri Jun 21, 2024 8:49 pm
Marcel: 1/4" is 6.35mm is 1/4" to my dual-units-of-measure Canadian brain... 8)
I'm jealous. You work with dual-units-of-measure. You have Robertson screws. You have poutine.
After graduating I considered emigrating to Canada. I sometimes still think I should have - but then, the winters...

Marcel.

sebashtionh
Vectric Apprentice
Posts: 62
Joined: Wed Oct 28, 2015 6:09 am
Model of CNC Machine: pilot pro 50x104
Location: Florida
Contact:

Re: material left in between cut out parts left is it enough or safe?

Post by sebashtionh »

Tailmaker wrote:
Fri Jun 21, 2024 9:06 pm
Hmm. If you want to nail into the narrow waste strip, you may have to run a shallow marking path of your outlines first. Or how will you know where to nail?
But even if you have only 1/4" as minimum waste width, you may find wider areas as long as your lines are not all straight.


this is what I mean buy 1/4 inch waste,
I would run a marking path first to mark where to composite nail the sheet down.
im trying to get all the parts out of one sheet
Attachments
quater inch waste.jpg

User avatar
FixitMike
Vectric Wizard
Posts: 2190
Joined: Sun Apr 17, 2011 5:21 am
Model of CNC Machine: Shark Pro Plus (retired)
Location: Burien, WA USA

Re: material left in between cut out parts left is it enough or safe?

Post by FixitMike »

The parts will be better fixed if you locate the tabs so they are lined up with each other on adjacent parts.
Good judgement comes from experience.
Experience comes from bad judgement.

Post Reply