My pair of gr01s and other bits an peices arrived a couple days ago, they look great! The wheels are really grippy aswell. Nicely packaged too :mrgreen:
Printable View
My pair of gr01s and other bits an peices arrived a couple days ago, they look great! The wheels are really grippy aswell. Nicely packaged too :mrgreen:
Ok thanks!
Good to hear Jonny, look forward to seeing what they go into!
Quick notice that as of now there are only three GR01's in stock with new stock not to be completed for another month so get your order in if you need one sooner!
Someone's entering a one wheeled robot into the champs then......
Looks like my mate got in just in time with her order- now we've got to try and build the damn thing before the UK champs :)
And that's the lot. Your friend should receive her motors tomorrow all being well.
New stock might well coincide with a new website if I've time to finish it (old one was a pain to update, new one will be much more flexible along with higher resolution product images). Of course all other products are still available at the moment.
100mm stroke actuators are back in stock earlier than expected and back on the website. 150mm and 200mm stroke models should hopefully arrive next week.
The new website is essentially finished and only waiting for new product pictures to be taken and edited in, which I'll hopefully be able to do next week.
Down to last 50mm actuator, with no restocking for another month at least. New supply of 150mm and 200mm actuators is in but won't be online until new website's up in around a week, do get in touch if you'd like one sooner.
The metal threads that are threaded into the Nylon (for mounting), what are those called? I could do with some for a project but the GRs are the only example of this component I know.
Thanks!
Here's an eBay supplier for the type used in the GR01's: http://www.ebay.co.uk/itm/M3-M4-M5-M6-M ... _500wt_922
You'll need an Arbor press to get them into the material.
Nylon is pretty ideal for them, you'd need a different kind for softer plastics like HDPE though- something with bigger 'splines' or an external larger pitch thread.
Perfect! Cheers Ewan.
they look like the threaded inserts i got off ebay
first trial of gimson motors in combat (for me at least)
for me: very good, had exelent power and felt very tough compared to the drills. no problems and a good motor.
Jonny: due to the larger wheel size, 170mm, the gearbox had to be retightened a couple of times. he can probably comment more
Looking to get a set of the 14.4v motors when they come back in stock (looks like that'll be today/tomorrow) so was really hoping for some reviews after Barnsley, cheers Harry :)
That reminds me; had one of the bearings pop out of the front plate of one of the gearboxes yesterday. I put this down to the violent behaviour of the robot as I spun up a horribly imbalanced drum.
Easy enough to pop back in, and not a problem that's likely to occur if you use the front plate as the mounting point. I mount mine using the bottom fixings but will probably put a thin cover on the front plate to keep it secured. Didn't seem to impair the drive though.
That is good information k_c_r. Adding a thin plate in front of the bearing won't harm anything.
Even a small strip just edging the bearing will do.
That's what put me of buying these in the first place as I mentioned on page 1;
What's stopping that front bearing poping out? Circlip on the output shaft?
Ewans response;
Re Dave: The bearings are press-fits (there's two, another on the hidden side of the Nylon front section), which is a more permanent solution in Nylon (as opposed to aluminium say) given its ability to deflect and maintain a compressive force on the outer bearing ring. They're not going anywhere basically, especially considering the lack of axial loads on them
I'd suggest aluminium to be a better bearing housing IMO, and as Jamie has proven... They are going anywhere.... Might suggest a circlip on the output to help retain it, and/or machine some thin front plates.
Self made ali front bearing retaining plate £0.0
Turned and milled Gimson GR01 mkII guestimated £45
Yet again you fail to see the point mario...
If you purchased a new car with m6 wheel nuts and the wheels kept falling of you wouldn't change them for bigger ones... You'd expect the manufacturer to get it right.
Good to hear Harry, they ought to be providing more torque than many cheap drills (the motors come from a factory making drills for the American market at RRP ~$45) as they're a different build of 'speed 550' than you'll normally find.
I first heard of the bearing popping issue last week, it seems either vibration and/or temperature changes (creating expansion/contraction of the plastic) are causing the problem rather than axial loads. I will now be recommending that all users put a small cover on the front of the motor of some form if they're not mounting via the front surface. I imagine that for those of you that it's happened to so far the second bearing took up the load? Not ideal but hopefully not a damaging problem- please contact me (or PM) if either pressing a bearing back is too difficult or you've had other issues and I'll make sure it's sorted.
Dave, Mario's hit the nail on the head in that it might not be the best motor/gearbox that money can buy but it's absolutely the best that £24 can- Nylon was used for the ease of machining and ease of threading (inserts) over aluminium which would cost significantly more to produce for the same function. Furthermore all parts, including front plates were cut on a 3-axis mill and so features are only cut into one side of each part hence the front bearing not being on the other side of the Nylon front piece.
Are they back in stock now Ewan? WIll be looking for a pair when the website allows it again.
Not yet but will be tomorrow, on the current website for now as the new one's still being finished
Double, sorry
You think so. I feel so stupid compared to you now.Quote:
Originally Posted by mr_turbulence
If you pay for a citycar, don't expect a sportscar.Quote:
If you purchased a new car with m6 wheel nuts and the wheels kept falling of you wouldn't change them for bigger ones... You'd expect the manufacturer to get it right.
You can , if you're willing to fork out the money, get the specs way up compared to the original, but then the question is, why didn't you buy the sportscar to start with?
Thanks Ewan.Quote:
Originally Posted by Ewan
the gimpson motors seemed to work alright in barnsleybot, though they didn't exactly get a good test as barnsleybot only competed in 1 fight (esc troubles).
the main problem was that the 4 bolts that hold the gearbox together came loose on the side with the wonky wheel. this allowed the metal tube to spin whilst the output shaft remained stationary.
Hi Jonny, when re-tightening the bolts it's a good idea to take the front of the gearbox off to ensure that the 'teeth' on one side of the outer ring/metal tube are in line with the grooves on the middle-piece, I'll post a picture shortly to illustrate.
https://lh6.googleusercontent.com/-f...2015.42.19.jpg
Here's what I mean, for the ring to spin the bolts must've become loose enough for the teeth to disengage, make sure they're in line for re-tightening and make sure they're well tightened or use super-glue on the bolts if you want to be sure of it not happening again.
There will be a more thorough picture series for the gearbox on the new website, currently waiting for some decent sunlight to take the next round of pictures (much cheaper than photographic lighting!).
Cheers Ewan, will be looking out for them :)Quote:
Originally Posted by ewan
Quote:
Originally Posted by Anttazz
The GR01 page has now been updated. As previously mentioned, further details and pictures of the gearbox including two small design changes mentioned on the page will be coming later this week, with the new website.
Again, thanks Ewan, have placed an order.
Cheers Tony, will be sent tomorrow and should be able to squeeze it in to 1st Class to be with you on Wednesday
Sweet :)
Got half of it today Ewan, presumably the other half will be here tomorrow. Thats the Royal Mail for you... :lol:
I will be getting bearing covers for the GR01 laser cut later this week- although it's not that difficult to make one up out of a scrap piece of material I think an off-the-shelf fix is worth doing to be able to offer the choice.
Website is a bit delayed at the moment due to a surge in business & bespoke projects, can't really complain though!
Just fitted mine today. Couple of bits of 4mm HDPE, took about five minutes total to make. Seems to do the job.Quote:
Originally Posted by ewan
You just getting aluminium ones laser cut?
Yeah, looking at £1.30 each, cut from 1mm Ali with two M5x10mm Stainless button-head screws for attaching. Will post pictures when they're done. Will sell separately from the GR01 so people have a choice of doing their own cover/mounting via the front (and so that the base price isn't changed).Quote:
You just getting aluminium ones laser cut?
Received mine Saturday morning (ordered Friday!) and took one to Whitwick today to show to a few people. Can't wait to fit them they look like they`ll be the business.
For anyone looking to do their own, here's a quick example. A 45mm x 45mm square of 4mm HDPE, two 5mm holes for fixings and one 12mm hole to clear the shaft:
[attachment=0:2tz6mes4]dr2_build (126).jpg[/attachment:2tz6mes4]
The new website is finally live!
It should hopefully be more consistent to navigate, though do let me know if you find any problems.
There's a couple of new accessories for actuators though most of the rest is unchanged.