Search found 22 matches

by Peter Withers
Mon Apr 12, 2021 8:43 pm
Forum: Universal Carrier
Topic: Armorpax's Armortek UC - No.18
Replies: 133
Views: 11915

Re: Armorpax's Armortek UC - No.18

Dave, for the first time I went through all the pictures of your whole build. In a word, amazing! The attention to detail is incredible. Truly a remarkable build.

All the best,
Pete Withers (the Ambulance).
by Peter Withers
Mon Apr 12, 2021 1:11 pm
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

Hi Dennis, my thoughts regarding motors and placement are to use 18V RS550 sized motors from a cordless drills complete with 16:1 gearbox. I have a pair of 3:1 reduction 90 degree gearsets so in combination I get the right kind of sprocket speed when the motors run at 18V. Those 3:1 gears are about ...
by Peter Withers
Sun Apr 11, 2021 8:12 pm
Forum: Universal Carrier
Topic: Universal Carrier Ambulance
Replies: 11
Views: 765

Re: Universal Carrier Ambulance

Thanks for the feedback :D Colour is definitely green. You can blame the camera operator, white balance is set for sunlight and this was under an incandescent bulb :? The battery is on a plate above the motor. Above that is a bracket with the electronics. It all fitted quite well. Speaker is at the ...
by Peter Withers
Sun Apr 11, 2021 6:52 pm
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

The UC ambulance is up and running with the modified brakes and a fairly significant additional mod. I have swapped the rear sprockets for some homemade ones with 8mm pitch. This engages far better with the tracks when under tension (whenever it is under power basically). The original sprockets have...
by Peter Withers
Sun Apr 11, 2021 6:41 pm
Forum: Universal Carrier
Topic: Universal Carrier Ambulance
Replies: 11
Views: 765

Re: Universal Carrier Ambulance

The ambulance is nearing completion, at least for now. I still have to fit the stretcher rails and some upholstered cushions for the seats. The drive train is modified and likely to get some more mods soon (see the post on modified steering brakes). The green paint is actually matt green 'camo' pain...
by Peter Withers
Sun Mar 28, 2021 5:48 pm
Forum: Universal Carrier
Topic: Do I............................
Replies: 7
Views: 368

Re: Do I............................

Do an ambulance, not that I'm biased of course...
by Peter Withers
Wed Mar 24, 2021 7:55 pm
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

My discs are shimmed to just miss the housing and even with full servo force I don't get any contact. The discs were a tight press fit on the threaded part anyway so there is little possibility of contact developing. Interesting on the drilled disc idea, it did cross my mind. Some while ago my 1/6th...
by Peter Withers
Wed Mar 24, 2021 7:18 am
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

Mike, have you retained the original servo linkages in your setup?

Thanks,
Pete W
by Peter Withers
Sun Mar 21, 2021 8:36 pm
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

Hi Peter, Just seen Viton on Ebay, what thickness did you use ? Would it be advisable to remake the shoes in steel ? Dennis. The piece I had was around 2mm thick, it was probably an offcut from work (I design equipment for the oil industry, viton is a favourite for O rings etc). I personally was ha...
by Peter Withers
Sat Mar 20, 2021 7:00 pm
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

More progress on UC 64 (the Ambulance) and the steering brakes. I now have removed the screws from the discs, added some friction material to the brake shoes, bedded in the diff (as recommended by Armortek) and it all works! I have reliable steering. The motor is still struggling slightly but some o...
by Peter Withers
Fri Mar 19, 2021 10:45 am
Forum: Universal Carrier
Topic: Armorpax's Armortek UC - No.18
Replies: 133
Views: 11915

Re: Armorpax's Armortek UC - No.18

It looks like a nice solution to the problem of the sprockets not meshing well with the tracks when they are under tension due to the loose fit of the split pins (as someone above alluded to). I'm pondering making new sprockets with wider pitch which will be fiddly but doable with my small lathe and...
by Peter Withers
Thu Mar 18, 2021 11:47 am
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

Peter, With regard to the screws holding the back axle in, I reversed mine so the nuts were on the inside and I drilled a small hole in the drive sprocket level with the cap heads so I could use and allen key from the outside. The cap heads can't be seen anyway as they are behind the drive sprocket...
by Peter Withers
Thu Mar 18, 2021 10:01 am
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

Peter - instead of changing to ball diffs (which will probably not be able to handle the torque - or if they can, will require frequent maintenance) either run the diff on a power tool to loosen it up or change the viscosity of the grease in the diff. OK, thank you for the advice, particularly on t...
by Peter Withers
Thu Mar 18, 2021 7:31 am
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

I finally tested my brake setup over the last couple of days. The first test was a failure, the tracks were too loose. I took 2 links out either side (I'm now about 8 links less than the number specified in the build documentation!) and on the second try everything worked a treat. The main issue is ...
by Peter Withers
Tue Mar 16, 2021 1:06 pm
Forum: Universal Carrier
Topic: Modified steering brakes
Replies: 21
Views: 1013

Re: Modified steering brakes

When I raced 1/8th scale IC cars the brakes we used were a brake pad material with 2 steel plates either side of the disc operated by a cam and considering we were doing up to 70 mph I never had to replaced the disc or the pads. I would like to do something similar but there's not a lot of room. I ...