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Forum topic by tvrgeek posted 02-23-2020 08:33 PM 522 views 0 times favorited 9 replies Add to Favorites Watch
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tvrgeek

657 posts in 2333 days


02-23-2020 08:33 PM

Got new belts for my 17-900 Delta drill press. Still vibration. Turns out it is the motor pulley. 35 thou runout. Motor shaft less than 1, idler about 1.5 thou, arbor about 1. Not damaged, so the previous owner must have put up with it for 20 or so years! Thank you crap Taiwan/Delta quality control. Of course, NLA so looks like best bet is to have it bored and a generic spacer sleeve put in.

Before everyone says a pulley is a pulley, the diameters are smaller than any off-the shelf pulley 1 3/4 to 3 3/8 where most are 2 to 4 inch. Don’t want to lose my slowest speed and not sure there is enough motor mount to go to the larger pulley range.

Strange, the belts were on it that fit fine were labeled A27 and A25.5. OK, I ordered same and they came in exactly as spec, 29 outside and 27.5 outside. Too loose! Old belts measure OUTSIDE 27 and 25.5! That is not how belts are supposed to be labeled.


9 replies so far

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HokieKen

12919 posts in 1822 days


#1 posted 02-23-2020 08:52 PM

Just a thought but, if you’re paying someone to machine it to sleeve it anyway, it may be cheaper to just have the pulley diameters turned enough to clean them up so they’re true to the bore. You’d loose a little of the diameter on each step but I doubt it would be significant. And you wouldn’t necessarily have to true up the outer diameters but you may want to for balance.

-- Kenny, SW VA, Go Hokies!!!

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tvrgeek

657 posts in 2333 days


#2 posted 02-23-2020 10:48 PM

If I had a lathe, the time needed would be worthwhile. I think bore is cheaper as it is one setup and one operation.
But, I MIGHT have scored a new one off e-bay. Aluminum, but that does not matter. Specs look really close. If pictures on E-bay are correct a lot of the descriptions are wrong.

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MrUnix

7849 posts in 2883 days


#3 posted 02-23-2020 11:48 PM

What is the bore diameter and how many steps?
Here is one close (1-3/4” to 3-1/4”) with 4 steps. Bore sizes of 1/2, 3/4 and 5/8”
At McMaster Carr

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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tvrgeek

657 posts in 2333 days


#4 posted 02-24-2020 02:27 AM

K55 is very close, might even be what I ordered. I wonder why I searched both McMaster and Grangers it did not come up. It is a bit short and may mean some miss-alignment of the belt. Fortunately V belts can take that. 2 5/16 vs 2 5/8. The Delta pulley has a bit of a step between the speeds. I assume to give clearance between belts on adjacent grooves. I may have to drill and tap for a setscrew as both this and the one I ordered have it in the middle groove, and that may be too high.

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tvrgeek

657 posts in 2333 days


#5 posted 02-24-2020 12:02 PM

Sure enough, the Chinese can’t read standards.
First of all, you don’t put an A or 4L series belt on a 1 3/4 pulley. But that was what was on it. ( no idea what Delta actually shipped, but they look old enough to be original) An AX is a far better choice but a 4L if you have to. One can cut their own notches on an A or 4L and it works fine.

Next, by standard dimensions, an A27 would be 1/2 inch wide and 28 3/4 (new cold) to 29 inches ( after run-in and stretched) inches outer circumference. But a Chinese A27 belt will be 7/16 wide and you guessed it, 27 inches outer circumference.

To confuse them further, a fractional belt, i.e. 4L series does go by the circumference, so a 4L275 or 4L270 matches a Chinese A27.

Not only were the two belts on my dril following this pattern, but went to the company WEB sites and looked up the two belts ( A27 and A 25.5) It is no wonder so many bad reviews for the wrong size belt when someone orders just what the belt is marked as!

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Steve

1843 posts in 1266 days


#6 posted 02-24-2020 05:48 PM

I have an older delta DP similar to yours and I remember it took me 3 tries to find the right belt for it. Such a pain. I had to buy a new drive pulley for it and lucked out with one from ebay.

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tvrgeek

657 posts in 2333 days


#7 posted 02-24-2020 05:56 PM

There were a couple on e-bay, but not returnable and very expensive. I suspect they made a lot of bad ones.
Ordered some cog belts that should be the right size.

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MrUnix

7849 posts in 2883 days


#8 posted 02-24-2020 06:10 PM

Just an FYI – Renovo claims to still have that pulley new and in stock.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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tvrgeek

657 posts in 2333 days


#9 posted 02-26-2020 08:42 PM

Well, got the generic pulley. Made by Chicago Die Casting. (P/N 140-5/8) Worst piece of garbage I have ever seen. It would have shredded the belt in 5 minuets or less. Even Horrible Freight pulleys were not this bad. Die flaws and not machined for the seam. Looks like it came out of the mold and someone just hit the bottoms with a 40 grit grinder.

With half an hour of needle file and emery work, I made it serviceable. Had to relocate the setscrew to the second groove, barely hitting the too short internal boss. ( after I filed the keyway to spec.) Anyway, about 5 thou runout instead of 35, so drill runs reasonably. ( No, not like a Nova DVR, but I now have just under $400 invested, not 4 times as much . ) I may to true it a bit more in-place.

Wound up win AX series belts which are far better than A or L1 series. Spec on them is still 2.2 inch minimum diameter, not the 1.75 of the Delta design, but far more flexible than the A series. Need to get one more to get the perfect sizes. I think it turns out to be AX 25 and AX 26.

I’ll check renovo. Problem is, would it be any better than the original Delta pulley that was on it? Did they make all of them bad?

Back to glueing up some table leg blanks. All this is to do WOODWORKING.

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