Great Dane excavating co.

[steamer]

If I got the right machine as yours from Grizzly the main spindle bearings are 6206-2RS. The 2RS means the bearings are sealed for life and don't require any more grease. I too have had problems with off shore bearings and they tend to be noisy. One thing to watch for is side load! if you had the spindle apart when you got the machine, you may have put some on when you put it back together without knowing it. Tapered rollers need preload when going together but not ball bearing. The reason ball bearings don't last long in a mill is, if your milling it's a top load on the bearing but drilling is a side load and that wears them out quicker.
Rob

[Cooper]

Thanks for the info on the mill, have to order a couple of those gears. Once I move this spring I may convert to cnc.

I started on frame. Going to get it roughed in first. I may have to make the center mount for the A arm of axle a bit more forward on account of length of motor. So waiting on that to get attachment points. Frame is made out of 1/2" x 1.75" alum.

[DADSGARAGE]

This will be interesting to watch take shape, can't wait to see how you're going to build yours....
KP

[Cooper]

My wife got a bunch of stickeybuns and I was told to not eat them all, sent her these messages



Then sent her this pic, saying he got them off the counter and ate them all!!



I don't know how she knew but she found out I framed the dog for eating the doughnuts and now she is wondering how much else he has been blamed for!! Lol!! Got sent to garage ! Again!!!

But all is good, aside from having a stomach ache. Got axle set up for locating shock and frame mounts. I really didn't want to mess with unbolting the vice but just had no way around it. I wanted to mill it bolted together so everything lines up when done. Had about an hour setting up. A lot of that time was trying to use the vice. Should have just unbolted it to start with, 10 min set up time after I did!!!

[Cooper]

I know things look pretty chunky, once all the arts are fitted and I know they will work I will be trimming and adding detail. I've been putting off mounting the differential pinion shaft but decided better do it. The bearing protruded a bit from axle housing so I had a lot of set up time with the 4 jaw chuck. That piece is also connecting outer axles together and a frame will mount to it. I also wanted to make a bit of play for bearings. Would rather add some shims to get correct mesh of gears than have to mill some more out. Not fun on set up to do that. .

[RCP57]

Lookin good!

[JAMMER]

Looks real good you will have a hard time breaking that. Ed

[Cooper]

Question for you guys, the differential I'm using has x number of teeth on pinion and x number on the big gear. Is that a reduction I should consider into wheel rpm? Like if pinion has 25 teeth and gear has 100 is that a 4:1 reduction? After thinking about this beast and weights wanting to haul, I may be putting motor under cab like 1:1 machines using the reduction gearbox same as the 1:1 machines. Gives me more room in front of axle. Yes over engineering this heavyweight. I've been crunching the numbers and just thought of the differential aspect, I did not figure that into the final rpm. I'll go and count teeth on differential pinion and spur gear and find out numbers. Thanks guys.

[doodlebug]

Originally Posted by Cooper

Question for you guys, the differential I'm using has x number of teeth on pinion and x number on the big gear. Is that a reduction I should consider into wheel rpm? Like if pinion has 25 teeth and gear has 100 is that a 4:1 reduction? After thinking about this beast and weights wanting to haul, I may be putting motor under cab like 1:1 machines using the reduction gearbox same as the 1:1 machines. Gives me more room in front of axle. Yes over engineering this heavyweight. I've been crunching the numbers and just thought of the differential aspect, I did not figure that into the final rpm. I'll go and count teeth on differential pinion and spur gear and find out numbers. Thanks guys.

Yes that's 4:1 ratio.
Cheers!

[DADSGARAGE]

Originally Posted by Cooper

Question for you guys, the differential I'm using has x number of teeth on pinion and x number on the big gear. Is that a reduction I should consider into wheel rpm? Like if pinion has 25 teeth and gear has 100 is that a 4:1 reduction? After thinking about this beast and weights wanting to haul, I may be putting motor under cab like 1:1 machines using the reduction gearbox same as the 1:1 machines. Gives me more room in front of axle. Yes over engineering this heavyweight. I've been crunching the numbers and just thought of the differential aspect, I did not figure that into the final rpm. I'll go and count teeth on differential pinion and spur gear and find out numbers. Thanks guys.

Hey Cooper....great job on the axle and susp. cylinders look great!! If you use a very small vent hole in the cylinders it might act a bit like a shock restricting the movement while the suspension is unloading...just a thought...

Something to remember/consider is the diameter of the tires when trying to figure out the ratio....my truck also has 8.5" tires and it is geared to turn the wheels at about 38rpm, 8.5 x 3.14159 = 26.7" circumference , 38x26.7=1014.7 inches per minute or 84.5 ft per minute. The banebots motor gear box actually turns at about 65-70rpm not the stated 90, at least the one I have turns at that speed, the 540 motor turns at 16800 divide that by 256 which is 65.6rpm on the output shaft. Here is a link that might also be helpful on calculating the needed power/torque....

http://www.robotshop.com/blog/en/dri...zing-tool-9698

Putting the motor up front and using a drive shaft will make it more like the real deal...should look great!!! I used chain drive for two reasons....easy to change gear ratios and the linear actuator is right in the middle of the frame rails so there was no way to run a drive shaft to the rear end. Did you do any more work/testing on the telescopic cylinders??? We have one in the shop at work, I think it's off a 789 not a 785 , one reason for the double acting telescopic cylinder is to decrease the time it takes to lower the box instead of just letting it drop under its own weight (time is money) , the other reason is it help hold the box down tight to the frame shims which helps add overall rigidity.
Looking forward to seeing the progress on this build...keep up the great work!!!

KP

[Cooper]

[bigford]

WTF!!! thats huge!!!

[Cooper]

The diff is 11 on pinion and 33 on spur, so that is a 3:1 reduction I need to factor in correct? And the black motor is been living on a shelf for a few years , it's been begging for some electricity!! 1200 kv and the other out runner has a low kv, 256? But is a bit slow for what I was using it for direct drive in a springer tugboat. Probably too low of a kv (rpm/volt) for this use.

[jasonthekid]

Holy smokes! Now that's a motor!

[Cooper]

Got some work done on suspension.




Possibly making a true air ride,,, probably not but it could work. Was planing on springs with orings as guides. Breather hole will be hidden on bottom and between rod and cylinder.

Was pushing down as hard as I could to compress the trapped air. Almost could bottom but not quite.


And got this, I decided to place the motor ,yup the big black one, under the hood so to speak and have the planetary gearbox in front of axle with a transfer gear to motor. Just like the 1:1. Why make this simple?? Always like way engineers have done the hard work on the 1:1 machines. So copy that .

[Cooper]

Some more done on shocks. So far they are just an air shock. Can push my whole body weight (as much as my hand can take) down on them without bottoming and they spring back. Maybe just go with air ride

[Cooper]

Ok got another gearbox today, a bit more robust, just a size comparison on planetary gearbox and motor along with one of our truck motors. gearbox is 4:1, 3:1, 3:1, and diff is another 3:1 reduction. Should end up around 90rpm. (Or 100) motor kv isn't an exact science) and with this gearbox I can make the last two or one stage a 4:1 if I need more reduction. I've settled on plans, rear with 3:1 differential, planetary gearbox with reduction in front of axle, two transfer gears to get driveshaft higher in frame, driveshaft to motor housed under hood. Very similar to the actual 1:1 machines.



All in my head at this point. I may start making some notes for reference

[egronvold]

[/QUOTE]

I guess "There's no substitute for cubic inches!"

[calum_scania]

Ok got another gearbox today, a bit more robust, just a size comparison on planetary gearbox and motor along with one of our truck motors. gearbox is 4:1, 3:1, 3:1, and diff is another 3:1 reduction. Should end up around 90rpm. (Or 100) motor kv isn't an exact science) and with this gearbox I can make the last two or one stage a 4:1 if I need more reduction. I've settled on plans, rear with 3:1 differential, planetary gearbox with reduction in front of axle, two transfer gears to get driveshaft higher in frame, driveshaft to motor housed under hood. Very similar to the actual 1:1 machines.

All in my head at this point. I may start making some notes for reference[/QUOTE]


This has maybe been asked before but there did you buy those motors from?

Calum

[Cooper]

Build it bigger right? Lol!! I keep having to remind myself this is still 1:14 scale!!