I am designing a mechanism that needs a Right-Angle gearbox with worm drive. But, I cannot find anything here that meets my needs, in terms of torque. So, I apparently need to go to another source. But, I am not finding anything that comes close to my needs that is stock at the suppliers I have spoken to. A few have offered a custom approach costing in the range of $1,000 USD, which is far too much.
I need the following;
]Right-Angle gearmotor with worm drive./:m] ]12v DC. (I can change to 24v if necessary)/:m] ]Output torque in the 200 to 400 in-lbs range. (edit. I can go as low as 150 in-lbs if necessary)/:m] ]RPM at output is only10 RPM under load./:m] ]Encoder./:m]
I can find motor controllers here at Robot Shop seems to be able to handle any DC motor with encoders. But, I can’t find a source for right-angle gearmotors that meet all my needs, and in particular ones that have encoders included, or even a provision to add one.
This sort of design effort is outside of my past job experience, but here is what I am speculating. While there are a lot of unique sizes, motors and gearmotors tend to be made to certain standards, so that they can be interchanged.
So, what I need to do is find a gearmotor with an encoder, that is compatible with a right-angle worm drive. Can anyone recommend a source to go to for this?’
We understand exactly what you are looking for. At this time we don’t offer any high torque worm gear drives, but will certainly keep an eye out when looking for new suppliers.
We don’t have any worm gear drives from other vendors to suggest (which can handle that torque).
In case you did not see this one: robotshop.com/en/vertical-sh … arbox.html
This is designed to be used with the ServoCity gearboxes we carry but uses a plastic worm gear and as such the torque is limited.
In order to get 10rpm, you would need a 300rpm gear motor, and the only one would be: robotshop.com/en/12v-303rpm- … motor.html
This has an output torque of ~3.5oz-in. When added to the worm drive, the torque would be multiplied by 30, so 105oz-in.
Based on your initial e-mail you need closer to 3200oz-in which would likely require an enclosed worm drive with metal case.
In reading about the NEMA standard, it seems to be specifically for stepper motors. I have attempted to find a worm gearbox that specifies a NEMA standard, but the only ones I found were for much larger motors that I plan on using. I also wonder if some of the manufacturers use the NEMA standard, but don’t specifically refer to it in the part description, so my search may not find them.
RobotShops part# RB-Sct-593 does not mention a NEMA standard, or even give dimenions for the mounting holes. Perhaps it is typical in the gearmotor industry to just expect the user to machine their own mounting sytem.
I think I may have finally found a worm gearbox that includes an encoder option, at a reasonable price. It is from an Italian company, CBF Motors. Their 752 26 1/10 [from 86 to 106 Euros-depending on options] with the EB 04 magnetic encoder [25 EUR] is a total of 111 EUR, which is $120 USD. The pricing is certainly extremely good. But, it is also possible that I am misunderstanding something, because of language issues.
There may be other manufacturers with similar offerings, but generally, if a web page does not provide English units, I tended to pass it by. This manufacturer, at least provided the English units, even if they don’t really provide for standard English sizes for the output shafts.
But, understanding their literature is a challenge. While they provide English translations on the PDFs, the charts are only labeled in Italian. One column is labeled Coppia S 2, with units as Nm. Another give Coppia Max. This translates to couple, pair, or match.
Any ideas what the word Coppia might be referring to?
