Chainsaw Repair

Chain - Grinders - Filing - Wood Milling - Tools - Welding - Machinist - Mowers - Tillers => Chain - Bars - Grinders - Filing => Topic started by: SquareFile on August 15, 2015, 06:16:49 am

Title: 3/8LP Picco rim sprocket
Post by: SquareFile on August 15, 2015, 06:16:49 am
I've had good gains in cutting speed using Stihl PS chain on 50cc saws. Thought I'd share on a mod that helped on small hub saws. I machined mini hub rims to fit small hub.





Title: Re: Picco rim sprockets
Post by: Cut4fun . on August 15, 2015, 10:27:48 am
Great idea.

That is so cool you can do that type of stuff. 
Title: Re: Picco rim sprockets
Post by: Eccentric on August 15, 2015, 04:00:47 pm
There'd be a market for those modified P-7 and P-8 rims if you decide to do a small production run of 'em.  I'd be down for a few.
Title: Re: Picco rim sprockets
Post by: 3000 FPS on August 15, 2015, 06:01:44 pm
That is a great idea.   Nice work.
Title: Re: Picco rim sprockets
Post by: HolmenTree on August 17, 2015, 08:45:51 am
Excellent market potential 8)
Title: Re: Picco rim sprockets
Post by: SquareFile on August 17, 2015, 11:00:17 am
Stihl picco rims are extremely hard. I can't modify them in a cost effective manner. I did notice Forester manufactures P-7 which I'm sure is softer.
Title: Re: Picco rim sprockets
Post by: fisaw on August 19, 2015, 12:28:50 pm
Nice mod
Title: Re: Picco rim sprockets
Post by: Philbert on August 19, 2015, 02:11:12 pm
I machined mini hub rims to fit small hub.
Mill?  Drill press? Hole saw? Rat-tail file? . . . . .

Inquiring minds want to know!

Philbert
Title: Re: Picco rim sprockets
Post by: Nathaniel Vansickle on August 19, 2015, 03:44:47 pm
Stihl picco rims are extremely hard. I can't modify them in a cost effective manner. I did notice Forester manufactures P-7 which I'm sure is softer.

seems to me i bought some of the "mini" spline forester rims once and they were small spline not the mini they were advertised as.
Title: Re: Picco rim sprockets
Post by: Cut4fun . on August 19, 2015, 04:22:35 pm
Stihl picco rims are extremely hard. I can't modify them in a cost effective manner. I did notice Forester manufactures P-7 which I'm sure is softer.

seems to me i bought some of the "mini" spline forester rims once and they were small spline not the mini they were advertised as.

IMO thats a good thing. Already small.
Title: Re: Picco rim sprockets
Post by: SquareFile on August 19, 2015, 08:03:33 pm
Stihl picco rims are extremely hard. I can't modify them in a cost effective manner. I did notice Forester manufactures P-7 which I'm sure is softer.

seems to me i bought some of the "mini" spline forester rims once and they were small spline not the mini they were advertised as.

http://www.ebay.com/itm/Chain-saw-Rim-Sprocket-7-Tooth-3-8-Pitch-Mini-Spline-11-16-fits-Stihl-/131194464458?hash=item1e8bcca8ca
This is the only picture I've seen of a A.M. picco. Don't mean its correct but it looks like mini.
Title: Re: Picco rim sprockets
Post by: SquareFile on August 19, 2015, 08:06:54 pm

Mill?  Drill press? Hole saw? Rat-tail file? . . . . .

Inquiring minds want to know!



Philbert

Mazak integrex 400y. 5 axis lathe with live tooling.
Title: Re: Picco rim sprockets
Post by: SquareFile on August 19, 2015, 08:10:52 pm
My quotes are all screwed up.  ??? ;D
Title: Re: Picco rim sprockets
Post by: Cut4fun . on August 19, 2015, 08:21:24 pm
My quotes are all screwed up.  ??? ;D

I tried to get what I think you were after. Close enough?
Title: Re: Picco rim sprockets
Post by: Philbert on August 19, 2015, 09:21:29 pm
Mazak integrex 400y. 5 axis lathe with live tooling.
Bit more than I have.  I was hoping for a little time with a Dremel and a triangular file . . .

Could someone with a basic metalworking lathe bore out the ID, or would the tooling catch on the spline slots?
I am assuming that I could make the new spline slots with a file?

Philbert
Title: Re: Picco rim sprockets
Post by: HolmenTree on August 19, 2015, 11:38:16 pm
Years ago I dug out my Dremil kit one day and stuck a P8 mini 7 spline rim in my bench vise.
With lots of patience I was able to grind away the bore and splines with different size stones. Got it to fit my 346XP and it actually worked really well with no vibration  running the Picco chain.
But found in larger wood the gearing was too high for the 346, I never bothered resizing a P7 and left it at that.
Title: Re: Picco rim sprockets
Post by: aclarke on August 20, 2015, 12:24:55 am
Cheapo lathe and a tool post grinder does just fine on those "super hard" sprockets.   Lol!!!
Title: Re: Picco rim sprockets
Post by: aclarke on August 20, 2015, 12:30:19 am
Why would Forester sprockets be softer?
Title: Re: Picco rim sprockets
Post by: SquareFile on August 20, 2015, 05:14:13 am
My experience with forester sprockets is they wear faster.

Title: Re: Picco rim sprockets
Post by: SquareFile on August 20, 2015, 05:55:14 am
Tool post grinder on a lathe would work well. Carbide inserts don't like the case hardening of these "super hard" rims. Lol
Title: Re: Picco rim sprockets
Post by: srcarr52 on August 20, 2015, 10:52:09 am
Tool post grinder on a lathe would work well. Carbide inserts don't like the case hardening of these "super hard" rims. Lol

I've cut down the OD of 8 pin .404 sprockets to make a lopro 8 pin standard spline before. Carbide doesn't like cutting them, but it will. I suppose shooting the holes for the splines was probably the worst on tooling.
Title: Re: Picco rim sprockets
Post by: SquareFile on August 20, 2015, 11:17:46 am
Tool post grinder on a lathe would work well. Carbide inserts don't like the case hardening of these "super hard" rims. Lol

I've cut down the OD of 8 pin .404 sprockets to make a lopro 8 pin standard spline before. Carbide doesn't like cutting them, but it will. I suppose shooting the holes for the splines was probably the worst on tooling.



Yes it was. Carbide end mill didn't care for it much.
Title: Re: Picco rim sprockets
Post by: Philbert on August 20, 2015, 12:14:51 pm
Would some type of abrasive method work better than hard tooling on the rim sprockets?

Philbert
Title: Re: Picco rim sprockets
Post by: aclarke on August 20, 2015, 12:51:10 pm
Would a ceramic cutter insert work on an interrupted cut or are they too brittle?
Title: Re: Picco rim sprockets
Post by: HolmenTree on August 20, 2015, 07:12:37 pm
Don't  laugh...here's  my red neck thinking. Slide the power head on your work bench with no b/c at 1/2 throttle with the face of the rim contacting the face of a rotating bench grinder  wheel.
The grinder wheel and rim sprocket should be rotating into each other.
Periodically check rim diameter  :D

Title: Re: Picco rim sprockets
Post by: SquareFile on August 20, 2015, 07:55:38 pm
That would work on the o.d. but not the I.D. to increase hub size
Title: Re: Picco rim sprockets
Post by: HolmenTree on August 20, 2015, 09:05:03 pm
No I was referring to turning down a .404 8T rim to the diameter of a P8 rim.
The .404 and Picco are a close fit. ;)
Title: Re: Picco rim sprockets
Post by: Cut4fun . on October 30, 2015, 10:55:43 pm
I used to run alot of big Danzco pin rims years ago racing.  What I am wondering if a 6T to use with 3/8LP picco for smaller saws could be made in small or if it would interfere with the spline. By Danzco.

Title: Re: Picco rim sprockets
Post by: Cut4fun . on September 25, 2016, 03:31:34 pm
Just saving info on measurements.

posted by Trigger-Time long ago

Stihl Picco 7T rim.....1.433 dia = 4.502 circumference 
Reg. 3/8 7T rim 1.380 dia = 4.335 circumference

+0.167
Title: Re: Picco rim sprockets
Post by: HolmenTree on September 25, 2016, 08:55:34 pm
I used to run alot of big Danzco pin rims years ago racing.  What I am wondering if a 6T to use with 3/8LP picco for smaller saws could be made in small or if it would interfere with the spline. By Danzco.


I'm as guilty as one former member on here for not getting projects done haha.
See no reason for a 6 pin Picco Danzco rim being made for a small 7 spline. Probably never made because not enough call for it.
You could remove a 6T spur sprocket from its drum, enlarge the bore big enough and silver solder it onto a small spline drum.
Should work just fine as the Husky outboard clutched connection to the oil pump worm gear would still work fine.
Title: Re: Picco rim sprockets
Post by: Cut4fun . on January 05, 2017, 03:08:38 pm
6K products = Danzco

 The sizes listed below are for .375 Picco pitch chain. If you need a special sprocket size please call us at 360-264-2141.

The larger tooth count sprockets may not work on a stock chain saw. We will not be responsible for the sprocket not performing well or problems with chain life or safety. You are assuming all risks when using them.

Part No.    Bore    Tooth Count    Description    OD
DS0241    Large Oregon 7 Spline    7    7T375PSB    1.46
DS0250    Large Oregon 7 Spline    8    8T375PSB    1.61
DS0246    Large Oregon 7 Spline    9    9T375PSB    1.94
DS0247    Large Oregon 7 Spline    10    10T375PSB    2.09
DS0255    Large Oregon 7 Spline    12    12T375PSB    2.61
DS0252    Small Oregon 7 Spline    7    7T375PSS    1.46
DS0249    Small Oregon 7 Spline    8    8T375PSS    1.61
DS0244    Small Oregon 7 Spline    9    9T375PSS    1.94
DS0245    Small Oregon 7 Spline    10    10T375PSS    2.09
DS0254    Small Oregon 7 Spline    12    12T375PSS    2.61

STIHL RIM SPROCKET (MS7) .375 X 7 TOOTH PICCO   3/8LP 00006421240   0000 642 1240

3/8LP Picco 8T 00006421241     0000 642 1241
     


     


Title: Re: Picco rim sprockets
Post by: HolmenTree on January 05, 2017, 04:55:11 pm
Good find Kevin! About time Danzco got on the bandwagon with the .375 LoPro rim sprockets. Probably all the interest in the Stihl PS chisel chain that fueled it.

No 6 pin unfortunately  but a 7 pin in small 7 spline would be a big seller for the small Husqvarna's.
Chainsaw millers can run the large 7 spline 7, 8, 9 pin rims .

10, 12 pin Picco rims? Modified saws cutting 6"x6" pine with a square filed PS chain? ;D
Title: Re: Picco rim sprockets
Post by: Philbert on January 05, 2017, 06:34:43 pm
Probably all the interest in the Stihl PS chisel chain that fueled it. . . . No 6 pin unfortunately  . . .

I once asked an Oregon rep about 3/8 low pro rim sprockets - he said that they were just too small.  Clearly, someone has figured how to make them, along with 1/4" pitch that I have seen on other threads. 

Nice that they fit the more common Oregon rims.

Philbert
Title: Re: Picco rim sprockets
Post by: Philbert on January 05, 2017, 06:38:45 pm
Looks like Danzco has changed their name:

http://www.6kproducts.com/chain_saw_sprocket.html

Philbert
Title: Re: Picco rim sprockets
Post by: Cut4fun . on January 05, 2017, 06:45:10 pm
6K products = Danzco

 

Looks like Danzco has changed their name:

http://www.6kproducts.com/chain_saw_sprocket.html

Philbert

 ;)
Title: Re: Picco rim sprockets
Post by: fisaw on January 20, 2017, 05:48:33 pm
The last few weeks i have been working in the forest with husky/stihl 50cc saws + MS200  3/8LP chains. Stihl 63PM  is the most used, the other two chains are 63PS  , oregon vxl. Stihl 63PM is more robust and "hevier" compared to oregon vxl, that's why I like it. During the 6-8 hour day i sharpen lightly 2-3 times.

Anyway, time will tell how long this drum/rim will last.  ( tools that i used, proxxon , sanding drum, diamond coated burr + one cold beer )
(http://u.cubeupload.com/finland1/StihlP7Oregonsmall.jpg)

3/8LP at the bottom.
(http://u.cubeupload.com/finland1/P7oregon38.jpg)

Left .325 oregon 95 , Right 63PM 3/8LP  comparison.
(http://u.cubeupload.com/finland1/325VPXvs38PM.jpg)
 
Title: Re: Picco rim sprockets
Post by: HolmenTree on January 21, 2017, 01:21:59 pm
Great job making that Picco rim fit the small spline drum.
Yes NK. 325 works great on a 50 cc saw, but a 63PS or PM works even better  8)
Title: Re: Picco rim sprockets
Post by: Philbert on January 21, 2017, 01:46:44 pm
Anyway, time will tell how long this drum/rim will last.  ( tools that i used, proxxon , sanding drum, diamond coated burr + one cold beer )

Nice sprocket mod!

Philbert
Title: Re: Picco rim sprockets
Post by: HolmenTree on January 21, 2017, 04:32:37 pm
Would be a great little business venture. Picco rims for small mount Husqvarna's.  ;)
Title: Re: Picco rim sprockets
Post by: Nathaniel Vansickle on January 24, 2017, 10:01:32 am
Would be a great little business venture. Picco rims for small mount Husqvarna's.  ;)

I already have them, they are expensive though.

takes 1 carbide endmill per rim

turning down 404 rims isnt much easier.
Title: Re: Picco rim sprockets
Post by: Cut4fun . on January 24, 2017, 11:46:40 am
Nate I tried the search on your website but nothing under rim or picco rim.   Was just going to post a link for the guys.

So you want to post a link to lead them to the watering hole?
Title: Re: Picco rim sprockets
Post by: Nathaniel Vansickle on January 24, 2017, 04:17:34 pm
Nate I tried the search on your website but nothing under rim or picco rim.   Was just going to post a link for the guys.

So you want to post a link to lead them to the watering hole?

they werent on the site....they were a had to know item.

they are on there now though.

http://performanceoutdoorequipment.com/search?q=3%2F8lp+rim&x=0&y=0
Title: Re: Picco rim sprockets
Post by: Eccentric on January 24, 2017, 06:08:14 pm
That's still not unreasonable.  Thanks for making those available to us!
Title: Re: Picco rim sprockets
Post by: Cut4fun . on January 24, 2017, 08:32:31 pm
Pretty cool. Thanks Nate. That will help those folks looking for the small and standard picco rims.
Title: Re: Picco rim sprockets
Post by: HolmenTree on January 24, 2017, 11:05:17 pm
Would be a great little business venture. Picco rims for small mount Husqvarna's.  ;)

I already have them, they are expensive though.

takes 1 carbide endmill per rim

turning down 404 rims isnt much easier.
l
Your prices are very reasonable and those carbides are probably not cheap either.
If  I ever get my 346XP NE back from my FIL I may just get one or two off you.
My 338XPT I'm running 63PS on it with the stock 6T spur. Your 7 T 3/8 Lo Pro rim would be a bit too much for it.
I do have a 7T .325 rim conversion for the 338 running NK chain. But the 6T spur and 63PS performs better.

I could run your rim on my 562 as I do have it converted to small spline drum  with 23RS on a7T rim....
562XP running 63PS  :o :D