prop cut back

[Collin_750sx]

can i cut back my prop my self or is this not recomended

 

[showmepro1200]

What are you going to use to do it?

 

[Collin_750sx]

well i dont know, i dont know what is involved? i have a ton of different tools i could use, but would have no idea how.

 

[#ZERO]

It has to be put on a lath machine to turn the hub down.

 

[Mike W]

Let someone do it that knows what they are doing. You could do more harm than good.

 

[Collin_750sx]

does any one konw of a place up in spokane , wa that can do this, or is it even worth it

 

[sjetrider]

It will take a special chuck for a lathe. We have had them cut back at local machine shop but it took him for ever. We debated making a chuck from an old drive shaft but you can send it out to Impros and get it back just as cheap buy the time its done. If you have 4 or 5 to do it would be worth it.

 

[showmepro1200]

Was my point in asking - if you don't have the specialized tool for it, it isn't recommended as a homegrown job to do. Now if you want to play on an old impeller, have at it, but not on a new $200+ part.

 

[Matt_E]

Skat Trak charges 30 bucks for this.

 

[Mouthfulloflake]

You could do it with an end mill as well, but you need to realise how to, and be able to cut it accurately, you want it to remain flat, or the impeller would wobble.

 

[Mark44]

The impeller would not wobble.
Cut back means that the back of the impeller hub was cut to place it closer to the veins in the pump it doesn't touch the vains just the shaft that mounts the impeller.

Mark44

 

[EvanB85]

Leave it to the pros when dealing with machining and low tolerance parts. A little mistake equals a little imbalance equals a big problem.

Matt mentioned sending it to skat trak. I think Impros is very reasonable too, and they will "recondition" it.

I'm all for DIY jobs, but only if you have the proper tools.

 

[Mouthfulloflake]

I know what it means, both of my concords are cut back ( both milled too, from the looks of the marks)

if that surface wasnt flat, the washer wouldnt have full contact, and only teh threads would keep the impeller perfectly centered in the pump.

its designed so that both threads, and a FLAT mating surface on the rear secure it in place, is it not?

The impeller would not wobble.
Cut back means that the back of the impeller hub was cut to place it closer to the veins in the pump it doesn't touch the vains just the shaft that mounts the impeller.

Mark44

 

[Mark44]

Yes it would be best if it was flat but if it wasn't I see no problem you would likely never know. Yo

Mark44

 

[Mouthfulloflake]

thats possible too I guess, but doesnt it pressing against that washer in the back determine the final torque?

I guess it just seems so tight I can see it doing odd things if it wasnt pushing flat...

but yeah, my main point was that it could be cut back on a mill as well as a lathe.

:biggrin:

Yes it would be best if it was flat but if it wasn't I see no problem you would likely never know. Yo

Mark44

 

[Mark44]

Yep cut square is best.

Mark44

 

[SUPERJET-113]

My local machine shop cut my new skat 12/17 swirl back 5mm for $30 and no shipping. I thought that was good price.

 

[CarterB]

can someone post some before and after pics...is there a noticeable gain from this?

 

[Mouthfulloflake]

pics wouldnt do you much good, but here is a photo showing my MASSIVE skills with mspaint to demonstrate where the material is removed.

also, some folks simply remove the washer from behind the impeller, its basically the same results, impeller moves closer to the veins in the pump.

 

[Mouthfulloflake]

here is the pic.

the red is the surface that gets cut on.