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Unread 09-02-2010, 23:56
Ken Leung's Avatar Unsung FIRST Hero
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8020 vs. Bosch

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
Attached Files
File Type: pdf extrusion comparison.pdf (236.7 KB, 110 views)
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Unread 10-02-2010, 00:42
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Re: 8020 vs. Bosch

Quote:
Originally Posted by Ken Leung View Post
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
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.
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Unread 10-02-2010, 00:47
Ken Leung's Avatar Unsung FIRST Hero
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Re: 8020 vs. Bosch

Quote:
Originally Posted by =Martin=Taylor= View Post

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.
I know the Eppersons also purchased 8020 from a supplier in San Jose. I would really appreciate if you can found out who the supplier is for me.

Also, forgot to ask this in the original post, but I am hopping someone can clarify the compatibility between the two brands. Specifically, if I have Bosch extrusions now, can I use 8020 hardware/t-nuts on the Bosch extrusions? Other about vice-versa?

The profiles and t-nut dimensions suggest they should be fine either way.
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1999-2001: Team 192 Gunn Robotics Team
2001-2002: Team 100, 192, 258, 419
2002-2004: Western Region Robotics Forum, Score Keeper @ Sac, Az, SVR, SC, CE, IRI, CalGames
2003-2004, 2006-2007: California Robot Games Manager
2008: MC in training @ Sac, CalGames
2009: Master of Ceremony @ Sac, CalGames
2010: GA in training @ SVR, Sac.
2010-2011: Mechanical Mentor, Team 115 MVRT
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Unread 10-02-2010, 01:52
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Re: 8020 vs. Bosch

When I was on 100 and we used 8020 we used toilet bolts in place of t-nuts in a lot of situations. Much cheaper and like Martin said, you can use lock nuts.

You still want a pretty healthy supply of drop in t-nuts because you'll always want to add something later that you didn't foresee.

At the time I think a somewhat local supplier (maybe Sacramento?) was giving FIRST teams a discount on 8020. That was about 7 years ago now though, so I'm not sure if they still do.

T nuts should fit equally well in either profile.
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