DOLMAR/MAKITA The Official Sachs Dolmar Dolmar Makita Dolmar Chainsaws Thread

[Simondo]

Thanks Simon. I've just been to take some photos and mine is different to yours, and is listed as an 85, not an 86, sorry for earlier error. My carb cover doesn't have that big silver screw in it. Interestingly, the 111 is much lighter than the 105, so I don't think something like the PS32 is warranted for my use, the 111 should cover all those smaller jobs.

Thats a real early all orange 111 . Look after the brake band trip (if its there) ...hens teeth would cover it. The first 111 saw like yours were light ! They were small as well.

 

[Simondo]

Why does it look so much like a Hooskie 2 series saw???

The colour and single pivot brake flag gives that sort of a impression I guess Jeff.

 

[RI Chevy]

Yes sir. Nonetheless a nice saw indeed!

 

[hump101]

Thats a real early all orange 111 . Look after the brake band trip (if its there) ...hens teeth would cover it. The first 111 saw like yours were light ! They were small as well.

It is a tiny saw, and very light, but seems really powerful. The brake works fine. What does a brake band trip look like? Is it the toggle that clicks on/off the brake? I can fabricate most parts if I can't buy them, so I'm not too worried.

What does that big silver screw head in your carb cover do? The one that is missing in mine?

 

[Simondo]

It is a tiny saw, and very light, but seems really powerful. The brake works fine. What does a brake band trip look like? Is it the toggle that clicks on/off the brake? I can fabricate most parts if I can't buy them, so I'm not too worried.

Yes its the black plastic part with a cylinder weight in it thats inside the clutch cover ..far left pic (early one)

 

[Simondo]

It is a tiny saw, and very light, but seems really powerful. The brake works fine. What does a brake band trip look like? Is it the toggle that clicks on/off the brake? I can fabricate most parts if I can't buy them, so I'm not too worried.

What does that big silver screw head in your carb cover do? The one that is missing in mine?

You have a single piece top cover, mine has a 2 piece top cover. There are two silver fasteners ,one left and right.

 

[Wilhelm]

Sachs-Dolmar 109/110/111/115 =>1988

 

[hump101]

Thanks so much Simon and Wilhelm. What a fantastic resource this place is, with knowledge and generosity like this on board.

To confirm, the brake band trip is labelled the weight holder, p/n 020 213 072/073, item 32 on fiche 5 of Wilhelms IPL?

 

[hump101]

I've stripped mine to take a look at the brake band trip and tickle the chain. The chain needs a lot more than a tickle, as one side is ground to a different angle than the other, but it will work out eventually.

The brake is shown off and engaged in the photos. "Brake band trip" is a much better description of its function than "weight holder", and it isn't immediately obvious to me why it has a weight in it at all, as the spring loads are far higher than any inertia forces from the tiny weight. Looking at it, the fine root of the leg that hooks the engagement lever is the likely failure point, along with the dowel that engages with the handle, and this entire part could easily be replaced with something a lot stronger machined from billet alloy or a fibre-filled polymer.

 

[old_sir_henry]

The brake is shown off and engaged in the photos. "Brake band trip" is a much better description of its function than "weight holder", and it isn't immediately obvious to me why it has a weight in it at all, as the spring loads are far higher than any inertia forces from the tiny weight.

In case of kickback the inertia of the weight is supposed to trigger the brake.

Looking at it, the fine root of the leg that hooks the engagement lever is the likely failure point,

Exactly, that is the by far most often cause of brake failure with the early 109-110-111-115

along with the dowel that engages with the handle, and this entire part could easily be replaced with something a lot stronger machined from billet alloy or a fibre-filled polymer.

I always wondered why they choose this failure-prone material first place.
If you could fabricate this part, I'll guess you could sell quite a few!

 

[hump101]

In case of kickback the inertia of the weight is supposed to trigger the brake.
I always wondered why they choose this failure-prone material first place.

You may have the answer right there. To make the weight effective in providing enough inertia to trigger the brake, they have had to make the trigger as light as possible relative to the weight (edit), since any mass in the trigger on the other side of the pivot (e.g. the thin little trigger arm) is acting to hold the brake off (edit) in a kickback. I will measure the weight and the brake holding torque to see what acceleration is required to release the trigger. From my brief feel, I think an unrealistic amount, or maybe mine is stiff?

I had understood that the action of the front hand on the lever as the saw rotates in a kickback was supposed to activate the brake?

If you could fabricate this part, I'll guess you could sell quite a few!

Not sure I want to be selling safety-critical components of a chainsaw!!! For my own use, though, I am happy to engineer parts.

The reason I bought the 111 is because my wife wanted me to have a saw with a brake, the old Homelite I've been using for 10 years doesn't have one.

Note: Edited to remove stupidity!

 

[hump101]

The release torque of the 111 brake when dirty is 0.242 Nm, which drops to 0.234 Nm when it is clean. The weight is 12 grammes, and the weight plus weight carrier is 17 grammes with a 20mm offset from the combined CoG and the lever arm. Thus to trip the brake in a kickback requires a linear acceleration at the brake of 7.41 g dirty, or 7.16 g clean. This is high, but not unrealistic, so a replacement part would need to mimic or improve on this.

A single solid piece machined from stainless steel would slightly more than halve the required acceleration, depending on the exact geometry, not allowing for any increase in friction on the pivot or the tooth. However, the above assumes quasi static forces, and there is a clever profile of the weight carrier so that the weight flings into a wedge, momentarily increasing the inertial force to release the catch, so the above numbers are excessively conservative.

Anyway, in summary, it is feasible to make a weight carrier and the geometry is not too complex.

 

[thedude74]

Picked this up at the pawn shop the other day. $20. Hypoid drive Makita!

 

[166]

 

[166]

1986 110-111-115 Parts IPL

 

[Wilhelm]

I got some run time with my Dolmar PS-311TH, this unit has a really weird handle alignment.

Cut some hornbeam for prepping pork and lamb.

She pulled good chips in that hornbeam.


Cut up some wind blown apple branch.


Not bad for this little package.

 

[166]

 

[Wilhelm]

View attachment 188542
View attachment 188543

That is a hot unit/package!

 

[FergusonTO35]

View attachment 188542
View attachment 188543

That thing is ready to eat some creamsicles!!

 

[RI Chevy]

Not quite so fast there sonny. Lol