Posted by Andy Grady. [PICTURE: SAME | NEW | HELP]
Coach on team #42, P.A.R.T.S, from Alvirne High School and Daniel Webster College.
Posted on 10/27/99 4:21 PM MST
I am in need of the stats for the Fischer Price Motors from last year. (torque curves, speed curves, etc.). Where could i find this info. Also my team had heard of a few problems with stripped gears and stuff in the gearbox that came with the FP Motors, has anyone had this problem? If so what was it? Thanx,
Andy Grady, DWC/Alvirne
Posted by Joe Johnson. [PICTURE: SAME | NEW | HELP]
Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.
Posted on 10/27/99 5:42 PM MST
In Reply to: Fischer Price Motor help needed posted by Andy Grady on 10/27/99 4:21 PM MST:
Andy,
I am sure I have all this at the office. But… I think it was in last year’s rules also (good old appendix H as I recall). As to problems with the motors/gearboxes, I know that a lot of teams had problems, but not all teams. One team basically replaced them after X rounds because they knew that after (X+1) rounds a gear would strip. Also, as I recall, some team posted on our old forum (link below) a Boston Gear that they modified to give them the long life they needed.
Try to rules from 1999 and our ‘old forums’ If you still have trouble let me know, I will try to re-post some of the info I have.
Joe J.
P.S. I found some info in the old rules Team Update #2:
FISHER-PRICE MOTOR INFORMATION
The following are approximate performance data for the Fisher-Price motor/gearbox
sets supplied in the kits. The motor used is a Mabuchi model RS-550PF-6534.
Teams wishing to obtain spare Fisher-Price motors, gearboxes, and switches should
purchase the Xtreme Machine model of Fisher-Price Powerwheels vehicles and remove
the motors, gearboxes, and switches.
Motor no-load speed 15,000 RPM
Motor stall current 57 A
Motor stall torque 0.363 N-m
Gearbox ratio 147:1
No-load speed w/gearbox 100 RPM (estimated)
Stall torque w/gearbox 34.7 N-m (estimated)
Posted by Andy Grady. [PICTURE: SAME | NEW | HELP]
Coach on team #42, P.A.R.T.S, from Alvirne High School and Daniel Webster College.
Posted on 10/27/99 7:48 PM MST
In Reply to: rules and chiefdelphi.com to the rescue!!! posted by Joe Johnson on 10/27/99 5:42 PM MST:
Thanks Joe, I just have one question, judging from the size of gear box there are 3 to 4 gears in it. Which gear or gears stripped? I am looking for this information because we are doin a project here at school, so i appriciate the help. Thanx,
Andy Grady, DWC/Alvirne
Posted by Bill Beatty.
Other on team #71, Team Hammond, from Team Hammond.
Posted on 10/28/99 7:23 AM MST
In Reply to: Re: rules and chiefdelphi.com to the rescue!!! posted by Andy Grady on 10/27/99 7:48 PM MST:
Andy
The final gear on the output shaft(?) is the problem. In the elimination rounds we were only getting a few matches out of a gear. We came up with a replacment rim made out of aluminum that fit into the case without modification. After cleaning out the gob of grease from inside the case there was no increase in weight.
BTW, Joe won’t believe this, but there are two different motor pinions and gear cases available. One has 16 teeth on motor pinion, other has 19. If you want your kid to have the hotest FP car on the block, make sure you get the high speed pinion
Bill Beatty
Posted by Andy Grady. [PICTURE: SAME | NEW | HELP]
Coach on team #42, P.A.R.T.S, from Alvirne High School and Daniel Webster College.
Posted on 10/28/99 11:28 AM MST
In Reply to: Re: rules and chiefdelphi.com to the rescue!!! posted by Bill Beatty on 10/28/99 7:23 AM MST:
Bill,
Would you happen to have the specs on the gear by any chance or no where I could find them?
Thanx,
Andy Grady, DWC/Alvirne
Posted by Dennis.
Coach on team #27, DaimlerChrysler/OSMTech Academy, from OSMTech Academy and DaimlerChrysler.
Posted on 10/28/99 8:44 PM MST
In Reply to: Re: rules and chiefdelphi.com to the rescue!!! posted by Andy Grady on 10/28/99 11:28 AM MST:
Andy,
We always fried one of the intermediate gears in the gear train. Happened 3 or 4 times, had to scrap the entire gearbox. We never had any issues with the last gear as Bill talked about.
Dennis
Posted by Bill Beatty.
Other on team #71, Team Hammond, from Team Hammond.
Posted on 10/30/99 1:40 PM MST
In Reply to: Re: rules and chiefdelphi.com to the rescue!!! posted by Andy Grady on 10/28/99 11:28 AM MST:
Andy
I am surprised to hear that Dennis had trouble with an intermmediate gear. All the troubles we and others I heard about were the output gear. We don’t have a cure for his problem, but replacing the rim for the final gear with metal works slick. We never had another problem. We did a similar fix as the one written up in an early posting on the Delphi site only they used the rim from a stock Boston gear. We couldn’t afford the weight, but had money available for the aluminum to make one from scratch. All our records are in our file at work so I can’t get anything for you until next week, but I think the teeth are standard 32DP. We turned the old rim off and bolted the new one on with button socket head bolts. It appeared to us that maybe the case was deflecting and allowing the gear to ■■■■ enough so that the teeth would fail on an angle. Strangely the mating pinion never caused us any problem.
Bill Beatty
Posted by Dennis.
Coach on team #27, DaimlerChrysler/OSMTech Academy, from OSMTech Academy and DaimlerChrysler.
Posted on 10/30/99 8:01 PM MST
In Reply to: Re: rules and chiefdelphi.com to the rescue!!! posted by Bill Beatty on 10/30/99 1:40 PM MST:
Andy and Bill
Bill you bring up a good point, our motor mounts fully supported the area around the last output gear. Thus, with this support maybe we just moved the failure point back a gear or two. So maybe we had gearbox defection in the middle of the gearbox.
Something to think about since we will most likely be given FP gearbox assy’s again next year.
Dennis
Posted by Bill Beatty.
Other on team #71, Team Hammond, from Team Hammond.
Posted on 11/2/99 6:42 PM MST
In Reply to: Re: rules and chiefdelphi.com to the rescue!!! posted by Andy Grady on 10/28/99 11:28 AM MST:
Andy
I finally had a chance to look up the gear. It is 16 DP with 54 teeth, PD of 3.375 and a face width of 1/2’. I am not sure under last years rules if it would be legal to use a Boston gear for the fix. We used an aluminum round from Small Parts for the blank and cut the teeth in the rim. The web was offset to one side for bolting to the web of the original gear. Bill Beatty
Posted by Joe Johnson. [PICTURE: SAME | NEW | HELP]
Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.
Posted on 11/2/99 8:59 PM MST
In Reply to: Re: rules and chiefdelphi.com to the rescue!!! posted by Bill Beatty on 11/2/99 6:42 PM MST:
I think that the additional hardware list had a number (6?) of sprockets and/or gears that could be purchased from any source.
If the Boston Gears were part of these 6, then I think they would have been legal.
Joe J.
Posted by Mike.
Student on team #175, Buzz, from Enrico Fermi High School and UTC - Hamilton Standard Space Systems.
Posted on 11/1/99 12:23 PM MST
In Reply to: Fischer Price Motor help needed posted by Andy Grady on 10/27/99 4:21 PM MST:
I don’t have the stats with me (althought our team did compute them) but from our FIRST aid program I can tell you that the Fisher Price motors are the most likely to blow up out of them all. I am pretty sure that the FP gearbox is made up of plastic so we saw a lot of stripped gears. To get around this some teams added their own metal gears. The FP motors will also get very hot if a lot of torque is applied. Hope this helps.
: I am in need of the stats for the Fischer Price Motors from last year. (torque curves, speed curves, etc.). Where could i find this info. Also my team had heard of a few problems with stripped gears and stuff in the gearbox that came with the FP Motors, has anyone had this problem? If so what was it? Thanx,
: Andy Grady, DWC/Alvirne