Aluminum Hold Downs

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Aluminum Hold Downs

Postby TonyB » Wed Feb 03, 2016 1:05 am

Inspired by NEO7CNC (his youtube channel: https://www.youtube.com/channel/UCRcZL- ... na811vMgGA)

I hunted around for a rectangular "stair-step" looking thing, which I found out was part of a clamping kit, which I bought ($48 I think):
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I then noticed the kit came with four rectangular "stair-stepped" pieces, which work really well for clamping, but only two clamps. This is one:
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So that resulted in me wanting four; so I designed and cut my own:
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This is my first project doing a 3-dimensional cut on aluminum. Turned out almost perfect IMO, there are a few things I intend to improve. I still need to cut 3 more, so that'll be good practice :D
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Re: Aluminum Hold Downs

Postby WillAdams » Wed Feb 03, 2016 2:14 am

Nice!

A while back there was a post made to Reddit, listing a 3D printing tool kit which could be bought at Harbor Freight Tools --- maybe we should do a similar list for CNC routing?
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Re: Aluminum Hold Downs

Postby AnonymousPerson » Wed Feb 03, 2016 11:31 am

Maybe provide a set of files, as "initial things you should cut out, which will help you with further projects"?
Last edited by AnonymousPerson on Wed Feb 03, 2016 12:45 pm, edited 1 time in total.
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Re: Aluminum Hold Downs

Postby WillAdams » Wed Feb 03, 2016 12:08 pm

Those, I think we have, just a bit scattered, and not called out as such --- I try to avoid editorializing when adding stuff to the wiki --- guess it’s time to go back to asking the community what to do about specific edits / alterations in a largish cleanup.
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Re: Aluminum Hold Downs

Postby Damin69 » Wed Feb 03, 2016 12:32 pm

Very nice. I may have to consider making some of these for my next clamps some time down the road.
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Re: Aluminum Hold Downs

Postby JeromyReno » Wed Feb 10, 2016 11:10 pm

looks good. making cool tools with cool tools is awesome
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Re: Aluminum Hold Downs

Postby TonyB » Mon Feb 15, 2016 3:50 pm

Cut three more.
Image

I had been cutting at 0.2mm depth per pass at 140 mm/min with a 4 flute high speed steel endmill. Out of curiousity, I had heard that aluminum should be cut extremely shallow and extremely fast, they even made the statement: "Whatever you're doing, go even shallower and even faster" so I decided to try it. I halved my depth and double my feed (0.1mm depth per pass at 280 mm/min). As you can imagine this worked fine; but I wanted more. In Mach3 you can adjust your feed by a percentage. I turned it to 200% and it cut great (0.1mm depth per pass at 560 mm/min). This effectively cuts a 1 hour run down to 30 min; gains! I cut three brackets in one day and could have done more.

I'll be posting more projects, hopefully in the near future. I'm upgrading the fuel system on my Supra, which will be me replacing everything from the firewall to the fuel pump. This will involve creating a few brackets. The biggest hold-up is that the engine/trans/driveshaft are in the way of the stock fuel lines, so I need to pull it all.
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Re: Aluminum Hold Downs

Postby Damin69 » Mon Feb 15, 2016 5:11 pm

I have been cutting alum at .002-.004 in. at between 30-40 in/min with very good results.
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Re: Aluminum Hold Downs

Postby TonyB » Mon Feb 15, 2016 8:42 pm

Damin69 wrote:I have been cutting alum at .002-.004 in. at between 30-40 in/min with very good results.


Sounds very similar.

Converting to millimeters:
0.0508mm - 0.1016mm and 762mm/min and 1016mm/min.

Thinking through this a bit further: if I went down to 0.05mm I should be able to safely go to 1120mm/min. When I went from 0.2mm to 0.1mm I was able to triple my feed rate. In theory if I go to 0.05mm I should be able to do triple my feed which is 1680mm/min which should halve my overall run-time again.

I'll play around with this on my next run of Aluminum; worst case scenario I just decrease my feed on the fly in Mach3.
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Re: Aluminum Hold Downs

Postby Damin69 » Mon Feb 15, 2016 9:02 pm

TonyB wrote:
Damin69 wrote:I have been cutting alum at .002-.004 in. at between 30-40 in/min with very good results.


Sounds very similar.

Converting to millimeters:
0.0508mm - 0.1016mm and 762mm/min and 1016mm/min.

Thinking through this a bit further: if I went down to 0.05mm I should be able to safely go to 1120mm/min. When I went from 0.2mm to 0.1mm I was able to triple my feed rate. In theory if I go to 0.05mm I should be able to do triple my feed which is 1680mm/min which should halve my overall run-time again.

I'll play around with this on my next run of Aluminum; worst case scenario I just decrease my feed on the fly in Mach3.

are you using a 1/4" bit you may be able to push you .1mm at 1000mm with a 1/4" bit. Oh I forgot to mention I was using a 2 flute bit on my runs.
Shapeoko 2 #6971
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Makita 0701, Nema23s, ACME Z Axis, Nema 23 Belt drive
Expanded to 1000 x 1800
Electronics upgrade C-10 BOB, SainSmart ST-M5045 drivers, Mach3
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