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ShopSabre CNC - How to Hold Down & Flatten Boards
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- čas přidán 27. 06. 2024
- In this episode, CNC Shawn talks about the simple process of holding down a warped board and flattening it with a ShopSabre CNC.
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Let us know what kinds of projects and tips you'd like to see in a future video.
I just use visqueen around the part to direct the vacuum to the part. Then I lay scraps of other material on the visqueen to keep it from getting tangled up with the dust collection brush.
Faster and cheaper.
What about making a vacuum pocket for a much smaller piece, like 3”x5”, on the SS 23 model with the 1-zone vac? Not necessarily to flatten the 3x5” piece out, but to hold something firmly that small without clamping?
Absolutely, vacuum fixtures are very popular and a great way to hold small parts as needed
Isn't your vacuum just pulling a warped board down, and then you're flattening the top.....but when the vacuum is released, the warp is still there?
This is the same as putting a warped boatd in a thickness planer. It'll come out thinner on the other end, but the warp hasnt been addressed.
You need to joint the board flat first, whether by using a jointer, or by using the method you described for flattening a slab.
By resurfacing both sides, you create a flat piece of material, this same process is used in nested based manufacturing - very commonly done for MDF Door processing & other cabinetry needs.
@@shopsabre hmm, either we're talking about 2 different things or......we're talking about 2 different things. I've never had to joint or plane warped MDF, in the same way as warped lumber.
What RPM and Inch per minute are you running on walnut?
Speed and RPM will vary by HP, cutter, and model -- Generally you will be between 10-12K RPM and 300-650IPM. On our IS Series we usually try to be around 12K @ 650IPM for this process, on this particular project we slowed things down a little bit and we did 10K at 350IPM.
Great -- let's assume everybody with a SS has a vacuum table...
Clamping boards is something a lot of people do traditionally for this application, in this one we use vacuum, if you don’t have vacuum, this isn’t for you.
Not everything can be for everyone.
@@shopsabre Can you sometime do a followup video with tips for doing this type of operation without a vacuum table?
@swp466 yep, we’ve done it previously on the live edge project we did but we absolutely can do this again
@@shopsabre Great, because work holding can always be a bit of a challenge. Most of what I do is repetitive machining, so I almost always use fixture plates. I have holes and threaded inserts in my MDF table that the plates index and bolt to, but for other jobs, there are options. One of the options you should highlight is a composite nail gun. I use that quite often if I can't use clamps and there's a chance of hitting the fastener with the cutter. Also double face (carpet) tape and blue tape with CA glue.
@swp466 we absolutely agree, we will do some more short videos on hold down ideas and strategies in the coming videos.