X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [206.46.252.46] (HELO vms046pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 948257 for flyrotary@lancaironline.net; Wed, 18 May 2005 00:10:47 -0400 Received: from verizon.net ([71.98.176.110]) by vms046.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0IGO00BQN3LYOAB6@vms046.mailsrvcs.net> for flyrotary@lancaironline.net; Tue, 17 May 2005 23:10:47 -0500 (CDT) Date: Wed, 18 May 2005 00:10:43 -0400 From: Finn Lassen Subject: Re: [FlyRotary] Re: Prop balancing? In-reply-to: To: Rotary motors in aircraft Message-id: <428AC043.2060704@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------070309060700010909060008 X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) This is a multi-part message in MIME format. --------------070309060700010909060008 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I paid about $15 for my +-5G accelerometer. Frequncy response should not be a factor. Let's say you do it at 1,200 prop RPM. That's only 20 Hz. Finn Michael McGee wrote: > When the DSS Micro factory guy was training us up on their unit he > remarked that if we broke the sensor it was a $500 bill to replace > it. Of course that's probably retail replacement price and > calibrated. If you were rolling your own there are a few tricks to > accommodate cheap accelerometer sensors. I think price goes up with > frequency response. > > Mike > > At 20:32 2005-05-17, you wrote: > >> Thanks Rusty. >> >> Looks like there could be a market for a similar simple unit for less >> than $500... >> >> Finn >> >> Russell Duffy wrote: >> >>> I wasn't the point man on the balancer quote. I believe it was the >>> personal balancer which is much cheaper. The Micro Vib does look >>> like a much more capable unit. I have used the Micro Vib with a tech >>> looking on. Simple system to use. I have no idea about support, they >>> were trying to sell us a system and were pretty eager. >>> Bill Jepson >>> >>> Hi Bill, >>> >>> I did get a quote from DSS today, and also talked to them about the >>> personal balancer. They seemed fine to deal with, so maybe it was >>> just me yesterday. >>> >>> Anyway, the personal balancer is a no frills unit, that only gives >>> you amplitude, and phase. You have to do all your own calculations >>> as far as how much weight to put on, etc. The unit, with no sensors >>> or cables is $1795, and the normal kit they sell is $2885, but >>> includes two accelerometers, cables, etc. I can easily see how you >>> were trimming this down to about $2400. >>> >>> While not fancy, it will do what you need it to do, but there is an >>> rpm limit of 4800, so you can't balance any engine parts above that. >>> >>> I also exchanged a couple more emails with ACES, and found that they >>> have a 2015 unit, that goes for about $3900 in a kit. The unit can >>> only acquire data from one channel at a time, though it is a two >>> channel unit. It and the 2020 both come with only one accelerometer >>> in the kit though. They originally quoted the 2020 because I had >>> mentioned it would be nice to do helo blades if necessary. They did >>> say that you could do rotor blades with the 2015, but it wasn't as >>> convenient. >>> >>> I plan to call the ACES guy tomorrow, and decide what to do (if >>> anything) from there. >>> >>> Thanks, >>> Rusty >>> >> --------------070309060700010909060008 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit I paid about $15 for my +-5G accelerometer. Frequncy response should not be a factor.
Let's say you do it at 1,200 prop RPM. That's only 20 Hz.

Finn

Michael McGee wrote:

When the DSS Micro factory guy was training us up on their unit he remarked that if we broke the sensor it was a $500 bill to replace it. Of course that's probably retail replacement price and calibrated. If you were rolling your own there are a few tricks to accommodate cheap accelerometer sensors. I think price goes up with frequency response.

Mike

At 20:32 2005-05-17, you wrote:

Thanks Rusty.

Looks like there could be a market for a similar simple unit for less than $500...

Finn

Russell Duffy wrote:

I wasn't the point man on the balancer quote. I believe it was the personal balancer which is much cheaper. The Micro Vib does look like a much more capable unit. I have used the Micro Vib with a tech looking on. Simple system to use. I have no idea about support, they were trying to sell us a system and were pretty eager.
Bill Jepson

Hi Bill,

I did get a quote from DSS today, and also talked to them about the personal balancer. They seemed fine to deal with, so maybe it was just me yesterday.

Anyway, the personal balancer is a no frills unit, that only gives you amplitude, and phase. You have to do all your own calculations as far as how much weight to put on, etc. The unit, with no sensors or cables is $1795, and the normal kit they sell is $2885, but includes two accelerometers, cables, etc. I can easily see how you were trimming this down to about $2400.

While not fancy, it will do what you need it to do, but there is an rpm limit of 4800, so you can't balance any engine parts above that.

I also exchanged a couple more emails with ACES, and found that they have a 2015 unit, that goes for about $3900 in a kit. The unit can only acquire data from one channel at a time, though it is a two channel unit. It and the 2020 both come with only one accelerometer in the kit though. They originally quoted the 2020 because I had mentioned it would be nice to do helo blades if necessary. They did say that you could do rotor blades with the 2015, but it wasn't as convenient.

I plan to call the ACES guy tomorrow, and decide what to do (if anything) from there.

Thanks,
Rusty

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