kgg

The main question is what are you planning on sewing and with what size of thread? The machines you have asked about are made for sewing fabric. The VEVOR appear to be a reseller of a wide range of Chinese stuff and have just put their Name on a clone machine. Support and parts maybe iffy. kgg

The synthetic transmission or motor oils have very little if any more odor then sewing machine oil these days. kgg

According to the Consew 206rb-5 Operating Manual ( Consew 206RB-5 Operating Instructions ) under Specifications section the machine is only rated for a #22 needle. That means it is rated to handle V92 in thicker materials or V138 in thinner materials. To use V207 you would need a #24 needle. I my opinion you would be much better off looking at a Juki DNU-1541S that is rated for V138 top and bobbin thread in thicker materials and is rated for #24 needle. kgg

In my area an old time repair guy uses transmission oil in machines when the owner wants the sewing speed increased to keep up with the operators to better get rid of machine heat buildup. kgg

I think at present time Juki is the main brand that most of the clones copy. They have been around since 1945. However not all their models are made in Japan some models are made in China. kgg

Nice hat I guess for those that don't know if they are coming or going. kgg

Which country are you in? If in North America a 4 wire could be a 220 volt single phase. When you see plugs missing it probably a good indicator that it was used in an industrial setting and directly wire into a circuit or the motor is shot. If the machine is in good operating condition plan on replacing the existing motor with a servo motor. A photo would also help. kgg

Nicely done. kgg

Which oil would be best for your machine, check the recommendation of the manufacturer for that particular machine. I think Adler recommends DA-68 for your machine. I don't know what the weight cross over is for this oil. The 32 and 22 I assume you are referring to is ISO 32 and ISO 22. The equivalent SAE for ISO 32 would be 10W and ISO 22 would be 5W. Sewing machine oil is a 5W white mineral oil that has a light viscosity that doesn't accumulate on the gears of machine. In my own machines I use a blend of synthetic oils but I am willing to take all the risks of not using sewing machine oil that the manufacture recommends. kgg

I think the 1541S would work but the CB4500 with the new narrow plate should also work well. kgg

I would keep it simple with a mechanical connection (wire / wire rope or chain) to a foot pedal and do the re-routing. The two problems I see with the linear solenoids are you have to spec the length of stroke and it is an all or nothing movement where with power on you get full stroke. If you need to turn the item like when doing a 90 degree turn you need to be able to lift the presser foot up slightly so you are probably going to have to force the presser foot level up by hand. A picture of your setup may help to get some suggestions. kgg

I have both the Juki DNU-1541 "S" and the Juki DU-1181N. First off if you are looking at a 1541 pay the $100 difference and get the 1541 "S" as it has a safety clutch. The main difference is the 1541 is rated for V138 on top and in the bobbin while the 1181N is rated for V92 but I have on occasion used V138 and both use the same size "M" bobbin but with different bobbin cases. The 1181N does not have a safety clutch and is a walking foot machine while the 1541 is a triple feed machine. The 1541 is a physically heavier machine and can handle heavier materials. The Juki DU-1181N costs about $1400 US and the Juki DNU-1541S costs about $1800 US. I have found that the 1541S doesn't like thinner stuff and those items are best left to the 1181N. You may want to check these video's on how the 1181N and the 1541S handle light, medium and heavy fabric. https://www.youtube.com/watch?v=IKJuKTrjsbw https://www.youtube.com/watch?v=4JES-2I7h3o This video will show the difference of the presser foot action on materials. https://www.youtube.com/watch?v=Elo3MeoOi5M kgg

Nice find. Natures choice. kgg

It is going to depend on what your trying to sew. Bonded Polyester has better resistance to UV and certain chemicals like bleach then Bonded Nylon does. Bonded Polyester is more flexible but produces more lint then Bonded Nylon. Darker thread colors in either bonded polyester or bonded nylon are stiffer then lighter colors due to the dying process. Excellent advice. Chinese threads are all over the place as far as quality and consistency with the 8 oz spools being the worst. Avoid the frustration spend the extra for a brand name thread like A&E (www.amefird.com) which are made in both USA and Canada. kgg

"To adjust the height of the needle bar" page 10, Section 18 of the manual " Adusting the needle -to-shuttle relationship" kgg

To add a bit more tension to the top thread try: i) top thread entering through the top hole of the post guide wrap it around to the back side and out the bottom hole in the post guide located on the top of the machine ii) top thread through the first hole in the vertical guide located on the main tensioner wrap it around and out the second hole and then onto the underside of the little guide pin. kgg

I didn't read that far down in the manual. Which brings up another question. How do the Cowboy and Cobra machines accommodate this without shuttle race backings??? kgg

For future reference you may want to check Wawak ( https://www.wawak.ca/ ) for needles and thread. A lot cheaper then most other suppliers in Ontario with fast delivery. Yesterday I ordered 5 packs of 135 x 16 in size #22, #23, #24 and they are supposed to be here tomorrow. kgg

What size of needle are you using and in how thick is the material? In thick / tough stuff you may have to move up to a #26 needle. A good reference thread to needle size can be found at https://www.tolindsewmach.com/thread-chart.html Top thread fraying at the needle more then likely indicates the top thread is being frayed because there isn't enough room for the needle, the bobbin thread and the top thread in the hole created by the needle. kgg

A very nice setup. I found this to be interesting. I'm wondering if your machine is based on an Alder rather then a Juki TSC-441. The reason this caught my attention was according to the Juki TSC-441 manual to get correct clearance between the needle and the shuttle which you probably need to do when going from the smallest needle to the largest or vise versa you move the shuttle drive shaft front bushing. Section 18 ( ADJUSTING THE NEEDLE-TO-SHUTTLE RELATIONSHIP ) of the manual. kgg

If I'm not mistaken this machine has the same capabilities as the PFAFF 335 and similar clone machines. Most of the 335 machines are really only capable of sewing with V92. This machine was probably setup to sew fabric and aggressive teeth may have been damaging the material. kgg

Just to add to the other suggestions. When I looked at your video's I did notice a shiner spot on the feed dog which may indicated it is rubbing somewhere as it moves inside the feed dog plate. I also suspect the presser feet may not seated all the way. I also would check for the feed dog for rubbing and the amount the feed dog rises above the feed dog plate. kgg

I would call the Leather Machine Co ( 1 909-930-5259 ) and ask them where and if they have a dealer close to you. kgg

There is another place that has parts called Japan Sewing Machine & Supply Co. ( (905) 764-0100 ) at 146 West Beaver Creek Rd Unit 5, Richmond Hill, ON L4B 1C2 ask for Chris. kgg

Remember the Juki LS-1341is only rated for V138 top and in the bobbin. Try V207 on top and V138 in the bobbin and see if that works. Also you may want to get a new Juki throat plate to try. It shouldn't be that expensive. kgg