servo motor or speed reducer pully? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Interior
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 12-17-2008, 05:41 PM
Registered User
 
Join Date: Jan 2006
Location: Lemont, Illinois
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
servo motor or speed reducer pully?

I have a Consew 255 RB2 that is way faster than I am. Even after changing the 3400 rpm clutch motor to 1750 rpm unit it is still too fast. I believe that my options are a servo motor or a speed reducer pulley setup. I would really appreciate some feedback on these. I have heard that servo motors lack power a low speed and are noisy but I don't know anyone that has used the speed reducer. I want to use this machine to do the interior for my 29' Dodge sedan and I need accuracy not speed. Thanks guys.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-17-2008, 11:45 PM
DanTwoLakes's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Contact adhesive
Last journal entry: 49 Packard
Last photo:
Join Date: Apr 2006
Location: Lake Tomahawk, Wisconsin
Age: 64
Posts: 5,732
Wiki Edits: 22

Thanks: 0
Thanked 124 Times in 117 Posts
O.K., A 1 HP electric motor running at 1750 RPMs produces 3 Ft. Lbs. of torque. So....a 1/2 HP motor ( which is what most industrial sewing machine motors are) running at 1750 RPMs produces 1.5 Ft. Lbs of torque. A clutch motor is either on or off, just like the clutch in a car. An experienced sewer, or an experienced driver, can make a car, or in this case a clutch motor, slip through the foot pedal (or clutch pedal) to make it a variable speed device, but this takes a lot of experience and it is still either on or off. The slower you go the more torque you can produce. Servo motors are constant torque devices, so at any speed, a 1/2 HP motor will produce 1.5 ft. lbs. of torque. A clutch motor running full speed will produce the same amount of rated HP and thus the same amount of torque, and perform exactly the same as a servo motor. But: clutch motors on sewing machines rarely, if ever, are run at full speed, so they are more powerful at slower motor speeds than servo motors.
What does this mean to a sewing machine operator? Although my sewing machines have less power than a traditional clutch motor at slower speeds, the accuracy and control I have over the machines more than outweighs any loss in power. I have been sewing for almost 35years, and I have yet to find a situation that the servos won't handle. I wholeheartedly recommend changing clutch motors to servo motors. If you can't afford to change to a servo motor, put an extremely smaller pulley on the clutch motor to slow the machine down. If you put a pulley on the clutch motor half the size of what came on the motor, the speed will be cut in half.

I sew every day for a living, and have a Consew 255 RB-3 and a Consew 226- R that I switched to servo motors. I have not noticed the tiniest bit of reduction in performance in either of the two machines.

BTW, sewing speed is not a factor in quality, .......ever.

After looking through my post, I realize that, once again, I may have over-answered the original question. If that is the case, I apologize.
__________________
__________________________________

No one lives forever, the trick is creating something that will.
__________________________________

Last edited by DanTwoLakes; 12-17-2008 at 11:55 PM.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-18-2008, 05:36 AM
Registered User
 
Last photo:
Join Date: Nov 2008
Location: Southern Maryland
Age: 68
Posts: 23
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I too have been sewing since the early 70's. I have three working power stands and about a dozen sewing heads that I swap around depending on what I am sewing. Two of my power stands have clutch motors and one has a servomotor. Either setup is sufficiently strong to do upholstery but I think the servomotor would provide more control for the beginning seamster. Like Dan said, it takes time and experience to learn how to slip the clutch and gain complete control over a machine on a clutch motor, a servomotor gives you that speed control right out of the box.

Ed
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-18-2008, 08:02 AM
DanTwoLakes's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Contact adhesive
Last journal entry: 49 Packard
Last photo:
Join Date: Apr 2006
Location: Lake Tomahawk, Wisconsin
Age: 64
Posts: 5,732
Wiki Edits: 22

Thanks: 0
Thanked 124 Times in 117 Posts
Quote:
Originally Posted by lamx
...... it takes time and experience to learn how to slip the clutch and gain complete control over a machine on a clutch motor, a servomotor gives you that speed control right out of the box.

Ed
Exactly, well put.
__________________
__________________________________

No one lives forever, the trick is creating something that will.
__________________________________
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-20-2008, 03:30 PM
Registered User
 
Join Date: Jan 2006
Location: Lemont, Illinois
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
servo motor or speed reducer pully?

Thank you both for your insight on servo motors. I will take your advise, the next step will be a servo. But which one? The prices for these motors range from $106.00 on up. Do you fellows have any suggestions on which would be the keepers or which to stay away from? Ironically the price of a speed reducer pulley was $125.00, actually more than a few of the servo motors. I don't want to give the impression that I am shopping for the lowest price. I would like to know who builds the best motor. Thanks again, Terry
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-20-2008, 04:16 PM
DanTwoLakes's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Contact adhesive
Last journal entry: 49 Packard
Last photo:
Join Date: Apr 2006
Location: Lake Tomahawk, Wisconsin
Age: 64
Posts: 5,732
Wiki Edits: 22

Thanks: 0
Thanked 124 Times in 117 Posts
Both of my servo motors are Reliable Sewquiet 3000. They have more adjustment than most other servo motors and I love them. They cost around $150, 3 years ago. I'm sure they are more now, but to me, they are worth it. I use them every day, and have not had the tiniest bit of problem with them.CLICK HERE

BTW, you don't need a speed reducer pulley, (also called a variable speed pulley) all you need is a plain old pulley (sheave) half the diameter of the one that's on your clutch motor now. The smaller the pulley on the clutch motor, the slower the speed of the sewing machine. Once you get used to a slower speed, you can start putting larger and larger pulleys as you become more experienced. You can get one for less than $20 at most full service hardware stores. You may need a shorter belt if you don't have enough adjustment to compensate.
__________________
__________________________________

No one lives forever, the trick is creating something that will.
__________________________________

Last edited by DanTwoLakes; 12-29-2008 at 10:33 AM.
Reply With Quote Quick reply to this message

Recent Interior posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
700r4 Servo Install won't fit oldchevy1956 Transmission - Rearend 4 04-28-2008 02:43 PM
700r4 4th gera servo problems fivewindowcoupe Transmission - Rearend 1 06-24-2007 04:36 PM
need help with a 12 v to 6 v reducer oldguy829 Electrical 32 08-21-2006 05:02 PM
700R4 Did I "miss" the band when reinstalling the servo? Bayley Transmission - Rearend 12 05-13-2006 01:07 AM
98 4L60E billet servo blown68ssrs Transmission - Rearend 1 05-30-2004 04:46 PM


All times are GMT -6. The time now is 10:24 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.