Grizzly G4000 - 9"x20" Metal Cutting Lathe - V-belt Replacement

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Replacing a worn out v-belt on my Grizzly G4000 metal cutting lathe plus testing a 3D printed belt.
V-belt / eBay listing (no longer works):
- www.ebay.com/it...
Similar listing on Amazon:
amzn.to/32fZjwP
I guess the belts were closer to $13 plus postage. This ended up being the lowest cost / fastest delivery alternative that I found. Many of the industrial supply places were around $10 plus ~$15 for UPS Ground that takes a week. It looks like prices have risen in 2022, now about US$25.00
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And as always, thanks for watching
Intro:
Louisiana Fairytale by Austin Rogers
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Опубликовано:

30 сен 2024

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Комментарии : 35

@johnbuettner9050 5 лет назад

I changed speeds to the 1000 rpm speed using the V belt that my lathe came with. The belt lasted about 2 hours. I figured it was just a poor belt and ordered a new one (made by Gates) and installed that and after about 30 minutes I looked at the belt and noticed that it was no longer running straight and had twisted. Any ideas, anyone?

@The4Crawler 5 лет назад

You might check the pulley alignment and make sure all the V's line up. Maybe one of the pulleys in in or out too far on the shaft. Or as another commenter noticed (on the toothed belt), one of the bushings that the pulley rides on had worn and was causing the pulley to run out of line.

@alt-w7130 7 лет назад

Have you ever think of changing the pulley system to use the normal V-Belts?

@The4Crawler 7 лет назад

I suppose that might work, but would involve a lot of time and effort. The 3 stacked pulleys are very compact due to the narrow v-belt, so going to a wider belt would increase that component size a lot. The shafts are not very long so you would have the pulleys overhanging the ends of the shafts. Plus the belt tensioner idler might have to be redesigned to work with wider belts.

@chuckhuff7123 7 месяцев назад

That's a wimpy belt to begin with 😮

@The4Crawler 7 месяцев назад

Yes, it's quite small. But it lets them fit the 3 stepped pulleys into a tight space and also serves as a mechanical "fuse" that slips or breaks before something expensive does.

@michaeldickey6225 5 лет назад

You ever have any issues with that toothed belt that drives the upper pulley slipping off? In my G4000 that belt that goes from the small pulley on the motor shaft to the upper set of pulleys immediately slides right toward the motor direction and would jump off if it weren't stopped by that cam the tightening lever is attached too. I can manually move it back to it's proper location, but it slides over again once the lathe is turned on.

@The4Crawler 5 лет назад

No, have not experienced that issue on my lathe. I would check alignment of all the pulleys and see if any of them are too far in or out.

@michaeldickey6225 5 лет назад

@@The4Crawler I saw that video where you changed the belt right after this one and checked the alignment, they look good. After some further investigation I think the issue is one of the bushings in that assembly is worn out, the whole thing can rock back and forth a few degrees off it's rotational axis. Once the tension is on it, it's pulled at and angle, and the belt slides off. I stopped it for now by sticking a piece of HDPE plastic behind it and I'm ordering some new bushings. Anyway, something to keep an eye out in the future on that G4000!

@The4Crawler 5 лет назад

Glad you found the issue. That would have been my next thing to look at. I went through and greased as much of that assembly as I could some years back. Probably worth doing again.

@kirklindstedt2018 Год назад

Don't start your lathe with the clutch engaged. You'll break belts that way..

@The4Crawler Год назад

Interesting. From the G4000 instruction manual: "The use of the Belt Tension Release Lever as a clutch should be restricted to those times when starting a heavier part turning and then at very low speed." I rarely turn heavier material, usually 1" dia. steel, 2" dia. in alum. and plastic.

@kirklindstedt2018 Год назад

@@The4Crawler Well I learn something new every day. I've had my G4000 for 20 years and never broke a belt. My manual only says that you can use the belt tension release lever as a clutch. So, it looks like they've updated the manual. My manual is dated 6/97.

@The4Crawler Год назад

@@kirklindstedt2018 Interesting. I didn't get a manual with my (used) lathe, so downloaded one in 2005. I suppose that could be used all the time. I have a foot switch on mine, so it's much easier/faster to just tap that for on/off that reaching up and over for the belt tension lever.

@navaho5430 6 лет назад

I bought 3 gates belts 9 years ago I use my lathe 5 days a week on average, and I have 2 gates belts left they are very strong.

@The4Crawler 6 лет назад

Good to hear. I generally get good use out of one belt, then I'll run into one that only lasts a month or two. My lathe gets a lot of use, maybe 3-4 hours operation per day, 6 days a week typically.

@kirklindstedt2018 Год назад

There are several internet manuals on the 9x20. I found this in the, "Rebuilding the Asian 9x20 Lathe" manual. There are two belts generally in use. If you have a 160XL cogged belt, then the other belt is 5M720. If you have a 170XL cogged belt, then it's 5M730.

@The4Crawler Год назад

Good information, thanks for sharing!

@peterhorrell 3 года назад

I cringe everytime I see your fingers tapping around the cogs while they are still moving...good info but watch those fingers!

@The4Crawler 3 года назад

Good point, thanks for the comment. Yes, with the camera angle it makes it look like my hand was much closer than it really was.

@wi11y1960 3 года назад

Search on "5M710 GATES Polyflex V-Belt" shows the belt available through many suppliers as well as amazon

@The4Crawler 3 года назад

Yes, that's a good search term. However, from time to time, it can be hard to find these belts in stock. That was the case when this video was made. Lots of suppliers, but most were out of stock or on back order.

@andyprefenx6778 Год назад

I honestly think it’s meant to be 710mm

@The4Crawler Год назад

Interesting, have you tried a shorter belt?

@berndtnording4856 Год назад

@@The4Crawler I have the 710 belt, tough to get it on the pulley and you can't use the tensioner, but it does work. I just ordered the 730 - best price now is $22

@karenhedin6893 2 года назад

What’s the link for this belt

@bking0740 4 года назад

Do you know the dimensions for the timing belt?

@The4Crawler 4 года назад

It's marked 160XL050 (1/2" wide) or some show 160XL037 (3/8" wide) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wGO3rVsOzYw.html

@mckeehan1943 5 лет назад

No one makes a belt better than gates

@karenhedin6893 2 года назад

What’s the link for this belt

@The4Crawler 2 года назад

Link in video description as always. Or below it that's easier: amzn.to/32fZjwP Other option is to search for "gates 5m730 belt" on Amazon/eBay/etc.

@GogebicYooper 3 года назад

The 3D nylon was an interesting experiment.

@The4Crawler 3 года назад

Yes, it was a bit of an experiment. I think with a dual extruder printer, it might be possible to print such a belt with a nylon inner core for the strength and a polyurethane outer layer for grip.

@GogebicYooper 3 года назад

@@The4Crawler A few years ago I bought a belt, about 3/4", and tried to cut it to fit the pulley grooves. The material is remarkable tough and maintaining a straight line was virtually impossible. Working the problem from the inside out with 3Dp sounds like an alternative plan. I look forward to your continued experimentation.