Need help testing amplifier fuse please?

I want to have 2 tablesaws (13 amp each) and a router (no more than 8 amp) running off of one box that hangs from the ceiling in the middle of the garage. Here's my plan, is it to code? In the sub-panel I have a 30 amp 240v breaker From the box I am running 10/3 romex to an octagon box screwed to a rafter in the ceiling. 2 hots a neutral and a ground From the center of the box cover (3/4" knockout) I install a wire mesh cable strain relief and run a 10/4 sjoow wire down to about 2 feet off of the floor. At the end of the wire I add another strain relief and run the sjoow wire into a deep metal square box. In the box, I use 2 hots on a DUPLEX 240V 20 amp receptacle and pigtail a hot to a standard 120v duplex receptacle, adding the neutral. Ground both and shazam! I know it will work but is it code AND the real question is, can a 240v 20 amp duplex receptacle handle 2 13 amp tablesaws running at the same time, as long as the feeder line is 30 amp and the breaker is 30 amp. Really it comes down to, when an outlet says it's rated for 20 amp is that 20 amp per outlet or combined. Yes, occasionally the tablesaws may run at the same time. Also, is there a better way to hang an outlet? Thank you so much. I love this forum. Hillel items in question: 250v duplex [url=http://www.amazon.com/gp/product/B000U39UY4/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=ATVPDKIKX0DER]Leviton 5822-I 20-Amp, 250-Volt, Narrow Body Duplex Receptacle, Straight Blade, Commercial Grade, Self Grounding, Ivory - Amazon.com[/url] strain relief: [url=http://www.amazon.com/gp/product/B003AUJVWU/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=ATVPDKIKX0DER]Leviton L7504 3/4-Inch, Straight, Male, Steel Body, Wide-Range Strain-Relief, .520, .730 Cord Range - Amazon.com[/url] or mixed voltage recpticle: [url=http://www.amazon.com/gp/product/B000U3BVMI/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ATVPDKIKX0DER]Leviton 5842-I 20 Amp, 125/250 Volt, Narrow Body Duplex Receptacle, Straight Blade, Commercial Grade, Self Grounding, Dual Voltage, Ivory - Amazon.com[/url]

Hello and pretty sure I'm ok with doing this, just wanted to verify. I have read and looked a diagrams. The white common's can simply just be tied together, since they're just there to make the circuit, correct? I'm having to wire up, in the same box, and single pole switch with an electric socket. The issue is, is that the path of juice is having to branch off to two other electric sockets, and it is getting complicated, by having to fasten all the white wires to the sides of this one main socket. If I could simply wire nut the white together, it'd be less stiff to work the socket back into the box. Thx, DM