servo motor Servo motor with syncro and speed reducer

[hansknec]

My Rex has not arrived yet, but I am not wasting time waiting..  I designed an even smaller drive gear that fits my servomotor.  This is a 16 tooth XL gear, so it will have even more reduction than the 30 tooth that @Reacher10 installed.  The hope is with the 16 tooth, and a minimum rpm of 100 on my servo, it will be slow enough and have enough torque to not have to change to a monster wheel or the 3d printed larger XL gear.  My servo is the 600 watt one sold as a generic non-brand on ebay for $80 without a synchro. Shaft with key is 15mm (.6")  I don't sew often enough to need the synchro.  One note if you are printing your own or if you are having one printed you need to specify "wall thickness" in the slicer to be a huge number (10) on this print so it becomes a solid with no infill.  Here is the Solidworks part file and the STL file for the smaller pinion drive.  I don't know how long a PLA printed gear will last, but I'm willing to try since it only costs pennies to print.

16 tooth.STL

16 tooth.SLDPRT

Edited May 4, 2020 by hansknec

[dikman]

I'm interested to see how it works out and how long it holds up. Simple enough to print a couple more and keep a spare handy.

[FlashG]

Hi Folks,

Newbie here.

I have a Rex bought primarily for canvas work , but I want to recover a nice old leather chair.  I struggled with it initially.  I put the large plastic wheel from Sailrite and it worked much better, but still needed a lot of finesse to start and stitch slowly.

I found  a used Consew with servo and syncro and I snagged it up. Works much better than I could ever get the Rex to sew. The Rex went under the workbench.

The Consew came with the original factory OEM servo motor.  I'd like to mount that to the Rex so I can do Zig-zag stitching.

I'd like to use the timing belt on the Rex upgrade. The OEM belts say XL - I assume they are metric, 5mm pitch. I am a bit confused because Sailrite sells pulley/belts that are 1/5" pitch. Can someone please verify that the pitch on the OEM belts on the Rex are 5mm XL?

So now I need a pulley for the retrofit servo to work with the large plastic Sailrite pulley. The servo has a 15mm shaft and a key slot. I haven't been able to find one on-line. Would any of you folks with 3-D printers be willing to print a couple and sell them to me? I'm not sure the number of teeth, so I'd like to try a few sizes from 16 - 30 teeth, or?

 

[DonInReno]

Sailrite should have a cogged pulley that will work - they use it on the industrial servo in their catalog.  At least as of a few years ago the cogged servo drive pulley was available separately.

The XL timing belts are all 1/5” in pitch, but do vary in width.   There are 1/4” wide, 5/16”, and 3/8”.   You will also see metric sizes, but they are the same belts, just listed in metric widths. You’ll be ordering the belt based on the number of teeth, the width and also what it’s made from - specialty belt suppliers will have half a dozen different constructions, but most sold on eBay or Amazon are ordinary black rubber.

 

Edited December 24, 2020 by Wizcrafts
Corrected spelling of "cogged"

[KiwiSteve]

On 11/16/2018 at 9:57 AM, Reacher10 said:

Here are the files in STL, DWG (Autocad 2000) and DXF formats

30 tooth.dxf 336.49 kB · 16 downloads

30 tooth.stl 216.68 kB · 17 downloads

flywheel.zip 474.72 kB · 10 downloads

30 tooth washer.dxf 18.76 kB · 6 downloads

30 tooth washer.stl 65.12 kB · 12 downloads

rex flywheel dxf.zip 266.93 kB · 14 downloads

sycro hub.dwg 43.59 kB · 7 downloads

sycro hub.dxf 19.13 kB · 6 downloads

sycro hub stl.zip 26.86 kB · 10 downloads

rex flywhee stll.zip 633.89 kB · 16 downloadsn Stl file

Newbie here from NZ. Downloaded and printed rex flywheel to slow down sailrite clone. New to sewing so need speed down to baby steps till I get the hang of it. Unfortunately was expecting about a 5.0 inch wheel but ended up with a 6.125. Not the same as blue wheels on the Rex machine. Photo included of modified ali pulley but still not slow enough 

Is there an stl. file available for the 5.0 wheel?

Cheers Steve

[europunk]

Hello all you amazing and fellow sailrite clone enthusiasts. I’m super new to the 3d print game. I just got my first sailrite clone and I’m short on the cash but want a MONSTER wheel. I have a newbie question how my of the 3d files do I need to download? Which ones? I’m have mine done online at cloud craft. Also what are the units of measurements? MM, CM, INCHES? Thank you all for your contributions and amazing advice. Ohh imusig all oem parts so no servo, just a plain ol’ OEM 1.5 amp motor.