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69kona

  • Karma: +13/-0
Machining taper on a lathe?
« on: December 17, 2016, 09:29:13 PM »
Hey guys I got the O.D machined and the inside cut to the size I want. That's as far a my lathe skills go lol . Any input on machining a taper ? Without a taper attachment ..


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Flusher

  • Karma: +84/-0
Re: Machining taper on a lathe?
« Reply #1 on: December 17, 2016, 09:34:50 PM »
How long of a taper? Looks like the compound should handle it.  If you can't cut it all in one pass, you cut as far as you can.  Then reposition the carriage to make a second cut and blend the two.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #2 on: December 17, 2016, 09:46:45 PM »
Ok I guess I try that Thanks Flusher . It a 2 inch long taper .



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Flusher

  • Karma: +84/-0
Re: Machining taper on a lathe?
« Reply #3 on: December 17, 2016, 10:04:09 PM »
The compound should handle 2" no problem.

Is that a velocity stack?
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #4 on: December 17, 2016, 10:12:48 PM »
Nozzle insert ..


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69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #5 on: December 18, 2016, 04:54:57 PM »
Worked great thanks for the tip Flusher 👍🏻


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Flusher

  • Karma: +84/-0
Re: Machining taper on a lathe?
« Reply #6 on: December 18, 2016, 06:05:28 PM »
Sweet!
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

Six-Oh-Nine

  • Karma: +28/-0
Re: Machining taper on a lathe?
« Reply #7 on: December 18, 2016, 10:49:07 PM »
Whoa... how small you choking that nozzle down to?


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The Bostick ®

Some people play hard to get, I play hard to want.

69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #8 on: December 19, 2016, 05:26:25 AM »

Quote from: Six-Oh-Nine on December 18, 2016, 10:49:07 PM
Whoa... how small you choking that nozzle down to?


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3.095..
I had a 3.250


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69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #9 on: December 19, 2016, 05:26:45 AM »
Too small ?


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GT Jets

  • Karma: +192/-0
Re: Machining taper on a lathe?
« Reply #10 on: December 19, 2016, 06:37:45 AM »
Quote from: 69kona on December 19, 2016, 05:26:25 AM
3.095..
I had a 3.250


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What's your thoughts on the smaller insert?

Unless your boat is silly,  Pringle potato chip light,  you may have crossed a line.

GT
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

GT Jets

  • Karma: +192/-0
Re: Machining taper on a lathe?
« Reply #11 on: December 19, 2016, 06:42:02 AM »
3.00" is the smallest they even make.

I have a feeling the sweet spot is 3.125"- 3.25".

JMO
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

Six-Oh-Nine

  • Karma: +28/-0
Re: Machining taper on a lathe?
« Reply #12 on: December 19, 2016, 08:58:49 AM »
Oh... 3.095 is not what I was expecting you to say... it just looks crazy small for some reason with how thick it is. Must be the photo... my eyes... or whatever. That is actually not too far out of the realm of normal... lot of gullwings like the 3.060-3.090 range.


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The Bostick ®

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69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #13 on: December 19, 2016, 01:03:55 PM »

Quote from: Six-Oh-Nine on December 19, 2016, 08:58:49 AM
Oh... 3.095 is not what I was expecting you to say... it just looks crazy small for some reason with how thick it is. Must be the photo... my eyes... or whatever. That is actually not too far out of the realm of normal... lot of gullwings like the 3.060-3.090 range.


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It's for a 16-6 ft deeper v hull  guessing 600lb +or-  . Do u think I'm in the ball park for size?


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69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #14 on: December 19, 2016, 01:29:40 PM »
Guessing on weight lol


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Flusher

  • Karma: +84/-0
Re: Machining taper on a lathe?
« Reply #15 on: December 19, 2016, 02:53:08 PM »
Quote from: 69kona on December 19, 2016, 01:03:55 PM
Do u think I'm in the ball park for size?

The good thing is, you now have options.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #16 on: December 19, 2016, 03:10:51 PM »

Quote from: Flusher on December 19, 2016, 02:53:08 PM
The good thing is, you now have options.
Would u say by going down in nozzle size, I'm gonna see higher suction pressure ? 


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69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #17 on: December 19, 2016, 03:13:54 PM »

Quote from: GT Jets on December 19, 2016, 06:37:45 AM
What's your thoughts on the smaller insert?

Unless your boat is silly,  Pringle potato chip light,  you may have crossed a line.

GT
I'm thinking I'll gain alittle more top end .


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Hoofy

  • Karma: +4/-0
Re: Machining taper on a lathe?
« Reply #18 on: December 19, 2016, 05:57:14 PM »
Quote from: 69kona on December 19, 2016, 03:13:54 PM
I'm thinking I'll gain alittle more top end .


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Lot easier to change props

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GT Jets

  • Karma: +192/-0
Re: Machining taper on a lathe?
« Reply #19 on: December 19, 2016, 06:46:22 PM »
Quote from: 69kona on December 19, 2016, 03:13:54 PM
I'm thinking I'll gain alittle more top end .


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RPM or MPH?

Or both?

My guess would be a loss of out of the hole with a barely measurable speed gain. Potentially a small loss in RPM depending of power curve.

GT
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #20 on: December 20, 2016, 06:35:58 AM »

Quote from: GT Jets on December 19, 2016, 06:46:22 PM
RPM or MPH?

Or both?

My guess would be a loss of out of the hole with a barely measurable speed gain. Potentially a small loss in RPM depending of power curve.

GT
Won't a bigger nozzle top out in speedwise faster than a smaller nozzle?
My thinking was buy running a smaller nozzle it may help my pumps slight  cavitation problem out of hole. Just me thinking here lol ...that it would desire less water .. Possibly bigger nozzle more water demand ?
In any case the pump is tight and it has a inducer .


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Flusher

  • Karma: +84/-0
Re: Machining taper on a lathe?
« Reply #21 on: December 20, 2016, 09:08:33 AM »
Quote from: 69kona on December 20, 2016, 06:35:58 AM
My thinking was buy running a smaller nozzle it may help my pumps slight  cavitation problem out of hole.

Indeed.

Increasing bowl pressure and therefore the pressure on the back side of the impeller by restricting the pump discharge (nozzle) will reduce cavitation.

Increasing nozzle size does not increase the pump's demand for water.  If the engine and impeller combination are able to push more water, a larger nozzle will allow the entire system to process more water.

Another thing to look at is the intake opening, biting edge, et al.  Configuring pump hardware is a balancing act represented by (P1 * V1) = (P2 * V2) where P = pressure and V = volume.  Think of the impeller as the "=".
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #22 on: December 20, 2016, 10:52:04 AM »

Quote from: Flusher on December 20, 2016, 09:08:33 AM
Indeed.

Increasing bowl pressure and therefore the pressure on the back side of the impeller by restricting the pump discharge (nozzle) will reduce cavitation.

Increasing nozzle size does not increase the pump's demand for water.  If the engine and impeller combination are able to push more water, a larger nozzle will allow the entire system to process more water.

Another thing to look at is the intake opening, biting edge, et al.  Configuring pump hardware is a balancing act represented by (P1 * V1) = (P2 * V2) where P = pressure and V = volume.  Think of the impeller as the "=".

Thanks for info ! This makes me think ...
Does it comes down to horsepower and boat weight  to help determine nozzle size?
I have a new motor that I put in this winter that has quit a bit more horsepower than the one mill .
I want to get the pump hardware dialed in ...



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Flusher

  • Karma: +84/-0
Re: Machining taper on a lathe?
« Reply #23 on: December 20, 2016, 11:51:05 AM »
Quote from: 69kona on December 20, 2016, 10:52:04 AM
Thanks for info ! This makes me think ...
Does it comes down to horsepower and boat weight  to help determine nozzle size?
I have a new motor that I put in this winter that has quit a bit more horsepower than the one mill .
I want to get the pump hardware dialed in ...

What impeller?  Is it turning at the peak horsepower RPM?  Particularly the front side of the impeller is prone to cavitation.  I would start there.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

69kona

  • Karma: +13/-0
Re: Machining taper on a lathe?
« Reply #24 on: December 20, 2016, 03:40:45 PM »

Quote from: Flusher on December 20, 2016, 11:51:05 AM
What impeller?  Is it turning at the peak horsepower RPM?  Particularly the front side of the impeller is prone to cavitation.  I would start there.
A impeller... with old motor I was spinning 5600rpm on the bottle and 5100rpm all motor


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