another cnc question

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Forum topic by Des posted 09-23-2010 04:43 PM 1110 views 0 times favorited 6 replies Add to Favorites Watch
View Des's profile


19 posts in 2942 days

09-23-2010 04:43 PM

does ANYONE have an idea as to how long it would take to program cnc software(and then rout it), to make a radiused 3” wide block of maple for sanding blocks. Also an educated guess at a cost would be helpful too…thanks

-- Des

6 replies so far

View brtech's profile


1029 posts in 2920 days

#1 posted 09-23-2010 06:43 PM

If you had experience: 10 minutes tops to program.

If you have no experience: 3 weeks to 3 months depending on your basic computer abilities and the programs you choose.

If you were running a batch of, say, 100 of them, then a SWAG of machine time is a minute a block.

Dunno on costs.

View Mario's profile


174 posts in 3394 days

#2 posted 09-23-2010 07:48 PM

Hi Des
With basic computer abilities it shouldn take you no more than 10 minutes to make the design, toolpaths, and cutting files. Setup would depend on the particular machine, in my case setting up the Shopbot for something like this would probably take 15 minutes from turning on the computer switch and having the material afixed to the spoilboard. Cutting a 3in wide block about 1.5in thick at a moderate speed /plunge with a 1/4 in cutter should take about 1minute. The running cost for cnc machining stands at about $1.00 a minute USA rate. Of course you would have to remove any tabs from your block and add any extra cleaning/sanding to the cost.

View rance's profile


4258 posts in 3158 days

#3 posted 09-23-2010 07:58 PM

I realize you didn’t ask, but unless you just really want to do CNC for fun, why not bandsaw the top curve(resaw) and smooth it out on a stationary belt sander?

(Preaching to myself: Don’t you just hate it when someone totally ignores your question and suggests an alternative method, not knowing why you asked it the way you did for a reason? ). :)

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View brtech's profile


1029 posts in 2920 days

#4 posted 09-24-2010 12:09 AM

I think I would mill a long piece of maple to 3” wide. Radius it on 4 sides with a router, cut on a chop saw and radius the ends if needed.

MarioF, I think this job needs a tool change. We would use maybe a spiral upcut to do an outline cut, then use a roundover bit for the radius.

View Ger21's profile


1074 posts in 3129 days

#5 posted 09-24-2010 12:55 AM

Are you talking a concave or convex block? That’s what I’m thinking, and it’ll take a bit longer than a minute to cut. I could program it and cut it in 30-45 minutes. Again, assuming a convex or concave block.

-- Gerry,

View Mario's profile


174 posts in 3394 days

#6 posted 09-24-2010 01:13 AM

brtech, forget about the tool change, for some reason I am starting to side with the router/chopsaw approach…..

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