DigitSmith

Toyota 830 Problems

Reply
 
Thread Tools Search this Thread
Old March 18th, 2021, 05:13 PM   #1 (permalink)
badger badger is offline
Junior Member
Join Date:
Mar 2021
Posts:
4
Liked:
0 times
Question Toyota 830 Problems

Being relatively new to the machine embroidery discipline, I humbly request the guidance of the more experienced members with regards to what I'm seeing on my Toyota 830.

I bought this Toyota 830 from an individual who had relatively severely neglected it. I have disassembled the entire needle case, reciprocator, thread wiper, and rotary hook assemblies down to the last screw, removing the built-up dirt and hardened grease and replacing worn and broken parts, before re-lubricating and reassembling. I've cleaned, renewed, and recalibrated virtually every inch of this machine, stopping short of disassembling the upper and lower shaft gear linkages.

Top thread: Madeira Polyneon 40wt and Robison-Anton Super Brite 40wt
Needle: Organ DBxK5 75/11
Bobbin thread: Fil-Tec magnetic black polyester
Hoop: Durkee round 180mm diameter
Stabilizer: Two layers of Vilene water-soluble
Base: TwillUSA PSA Sport Twill (pressure-sensitive adhesive polyester)

1. Thread Tensions

Most sources indicate that bobbin tension should be between 18 and 22 grams, with a few saying that 2530 is normal for polyester. Those same sources suggest top thread tension between 120150g for polyester. However, the Toyota 830 user manual states that bobbin tensions between 2530g are nominal, and it declines altogether to specify any absolute needle thread tension, only providing the 1/3 bobbin thread rule for satin stitches as an indicator of proper tension.

Using a bobbin tension gauge, I set my Towa bobbin case to about 30g. When running tests, I've been unable to achieve the ideal 1/3 bobbin ratio on my satin stitches unless I drastically reduce top thread tension, often to as low as 100g, according to the Tajima gauge. If I want to bring top thread tension up to about 120130g while still producing the 1/3 bobbin ratio, I'm forced to raise my bobbin tension to at least 35g, a condition that seems to produce excess pulling of the thread and material while stitching. Things are further complicated by direct relationship between top thread tension and machine stitching speed

When dialing in tensions, I usually use a short, horizontal 4mm satin stitch and sometimes a series of tests consisting of the letters "TOX" in various sizes.

Question: What is normal behavior? Will low top thread tensions increase the likelihood of top thread loops, or are some loops inevitable? If every source I've read agrees on 120150g top thread tension, why does my machine seem to prefer lower tension?



2. Intolerance of Higher Speeds

My machine seems to perform far better at 350400SPM. When I start to edge the stitching speed up to 600SPM, all sorts of inaccuracies and anomalies begin to surface.




I highly doubt it's the pantograph belt tension, as I've already been through extensive troubleshooting down that path, but I'm always expecting to be schooled. Perhaps it could be an aged capacitor on the motherboard sending unstable current to the DC motor? Could it be aged belts that need to be replaced entirely? Something else?

Question: Is the inaccuracy at such a normal speed (600SPM) by today's standards expected for such an old machine, or should I keep trying to track down the problem?

Again, I'm extremely grateful for any help you can offer. Some of the projects I'm trying to complete require a high degree of both accuracy and precision, and I'd very much like to give this machine a second lease on productive service.
Attached Thumbnails
Toyota 830 Problems-top_loop_00.png   Toyota 830 Problems-zigzag_00.png   Toyota 830 Problems-lettering_00.png  
Send a private message to badger ContactReply & Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Toyota 830 motor Magic Stitches Embroidery and Digitizing 3 February 1st, 2012 04:58 PM
830 Toyota For Sale $3200 Cowgirl Jo Old Embroidery Ads 2 November 2nd, 2011 11:39 AM
Toyota 830 & 820, Computer, Software, Key.... & everything that goes with it moose Old Embroidery Ads 0 August 4th, 2011 01:54 PM
Toyota -Single Head, 12 Needle, Expert Model 830 ESP thorntonec@charter.net Old Embroidery Ads 3 October 17th, 2006 10:15 AM

All times are GMT -4. The time now is 07:32 AM.
Copyright © 2011 DigitSmith. All rights reserved.
Forums software by VBulletin, Copyright © 2000-2021, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.