Quote:
Originally Posted by Ken Leung
Hi Everyone,
I could use some expert opinion on the difference between 8020 and Bosch extrusions. I am looking specifically at the 30-30 (mm) series.
Check out the attached pdf for a quick comparison between the two brands' profile in AutoCAD. Then take a look at the different dimensions between the two brands' t-nuts.
We are having difficulties with our local Bosch distributor, and are considering switching to 8020 instead. Are there any advantages/disadvantages one way or another?
-Ken L
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I've never used bosch, but my team has used 8020 many a time. We are using two short pieces on this year's bot.
We have always purchased the 8020 from a certain supplier in San Jose. I don't remember the name, but if you're interested I can talk to the other team 100 mentors who have been there. I recommend this place specifically because they keep 8020 in stock and you can go and pick it up in a day.
Be careful about ordering online or through one of 8020s distributors. Some of them are horrible and take forever.
As for fasteners, team 100 uses
1/4-20 carriage bolts. It so happens that the heads slide perfectly into the slots, and the square part prevents them from spinning. So instead of threading in a bolt you can screw on a lock-nut.
Biscuits and drop-ins will drive you
crazy 
. Not to mention that they have a habit of falling out!
Locknuts solve this problem.
Save yourself some sanity, time, and money and buy carriage bolts from your local OSH.