Hi All,
I am trying to find info that the micro servo brackets can be used along with the standard sized brackets - are they compatible ? Meaning do the hole patterns match up etc ?
The 2nd question is: looking at the Humanoid Biped Arm Pair assembly guide lynxmotion.com/images/html/build088.htm - can this be built with the micro servo brackets ?
I found the equivalents for ASB-04 - Multi Purpose Bracket = ASB-301 Micro Multi and ASB-09 “C” bracket = ASB-302 Micro “C”
but nothing for the “L” Connectors (ASB-06) or the Offset Brackets (ASB-11).
I did read in one post that “L” connectors are compatible with the micro brackets.
May be the Offset Brackets can be replaced with Micro Long “C” ASB-303 ? (without the offset ofcourse!).
I am trying to find info that the micro servo brackets can be used along with the standard sized brackets - are they compatible ? Meaning do the hole patterns match up etc ?
Good question. Take ASB-301 for example: lynxmotion.com/p-691-aluminu … -pack.aspx
Notice that rather than holes, there are slots - this allows the holes on the “standard” SES pattern to be used with the holes from the “micro” SES pattern.
Therefore if you consider the outer two mounting holes on ASB-303 (not the one in the center): lynxmotion.com/p-693-aluminu … -pack.aspx
These are not slots and would therefore not line up with the “standard” SES pattern.
can [the Humanoid Biped Arm Pair assembly] be built with the micro servo brackets ?
Physically? Sure. Would it have enough torque at the shoulder to lift the weight of the arm? No clue (at least not without calculations), but likely not.
You’d be better off using a standard sized servo at the shoulder. This is a bit experimental, so no guarantees.
The L-connectors used in the standard sized SES brackets can be used for the micro SES brackets as well.
Maybe the Offset Brackets can be replaced with Micro Long “C” ASB-303 ?
Physically, sure - but you need to worry about the torque which a micro servo can provide - it may not be able to lift the rest of the arm.
Thanks for the quick response! couple of comments from my side.
**Looking at the recommended HS-85BB (49 oz. in) or MG (67 oz. in) - would I total up the weight of the servos + brackets to arrive at a decision - whether the servo will lift the arm or not ?
I have not done this type of design so looking for expert advice! **
Thanks again!
Try this if you want the arm to be able to support itself when horizontal: robotshop.com/robot-arm.html
There’s a tutorial which goes with it. robotshop.com/robot-arm-torque-tutorial.html
The weight of each product is on the website (if a product is sold as a two-pack, then one bracket is half the weight).
One additional question - I know the web pages show the weight… but I don’t see the length! I don’t have any micro brackets so I have no way to enter the L variable in the calculators.
It would be nice to have the length and other dimensions besides weight of these micro brackets!
Very good point. We do offer the CAD models here for the brackets: lynxmotion.com/s-5-ses-3d-models.aspx
We’ll look into posting dimensional drawings of the brackets.
ASB-303: 38mm between the center axis of rotation to the bottom of the bracket
ASB-302: 22mm between the center axis of rotation to the bottom of the bracket
I just noticed that the weight is given as a number but no UOM - ASB-301 shows as 0.09 (oz ? lbs ? kgs?) . When I checked the weight of the HS-85BB it says 0.05 but the actual specs say 0.67 oz. ASB-26 and ASB-22 show as 0.05. I wonder if 0.05 is some sort of default value.
I need to calculate the weight of an assembly but not sure if I can use the weight shown in the product pages reliably.
Thanks
Gee - I would have never thought of that !!! I hope you replied in jest.
Would be nice to have an unlimited budget (and plenty of free time) to do what you suggest - I could order all of the SES and sit around all day long building and weighing.
Unfortunately not all of us are that lucky.
A simple question as to what those weight specifications meant and a simple answer that is factual and useful.
The ASB-301 package (two brackets, hardware and bag) weighs 22g, which converts to 0.0484lbs, or 0.776 oz. Each bracket weighs ~9g. We’ll look into the weights displayed on the website and see if we can clarify a bit. So either some of the figures are wrong, or they are in units we don’t understand.
For your immediate need for calculations purposes, consider the weight of each micro bracket to be ~11g, the weight of each standard bracket to be around 16g (C-bracket, multipurpose bracket etc) including hardware. The vast majority of the torque will go to lifting the servos, not the brackets.
Hi Coleman! Now that is useful information - many thanks. I did build two arms using standard servos and 4 servos per arm - each arm weighs 8 oz.
using the standard Torso (with 5 servos) and brat legs (3 servos each with standard C brackets) the arms come down all the way to the feet - kind of like a gorilla
Considering the length and the weight I have a tough choice to rebuild the arms with micro brackets and servos - probably would look nice also (may be proportional ? ).
My calculated costs come to about $300 just for the micro hands with micro servos so I want to be a bit better informed before I order and find out it may not work - so my questions!
As to my comments on luck - it was more about money and time - of course you are lucky to have access to the items
