PDA

View Full Version : F y i



Pete Wass
12-06-2018, 11:07 AM
I have needed a bit less length in the spindle of my lathe to chamber shorter barrels and because there is so much stick out with my 4 jaw chuck, decided to come up with a front spider. I made a run at one before I left for Florida but becaues I operate without prior reasearch, didn't like the result I came up with so shelved it until spring.

Yesterday I Googled Lathe Spiders and up pops a page with something offered by Grizzly so I looks at the add. Here is a real life picture of an aluminum spider, complete with brass tipped screws and pre-drilled for attaching screws. They go on to say the offing is designed to bolt to one's face plate. $30.00 plus shipping. Several key strokes later and one is on the hated UPS truck. Saves buying a dividing hear, after all :).

Pete

MilGunsmith
12-06-2018, 04:24 PM
Instead of bolting it to the faceplate every time you need it, find a chuck backplate and make a permanent solution.

Louis.J
12-06-2018, 06:54 PM
They used to offer one as such with either one of the D's or a screw on spindle type.

Pete Wass
12-06-2018, 11:38 PM
Instead of bolting it to the faceplate every time you need it, find a chuck backplate and make a permanent solution.

I think I may have a dog plate big enough to bolt it to, I can't see my ever using a dog plate but if I don't I'll buy a backing plate of appropriate size.


Pete

adamsgt
12-07-2018, 12:00 AM
I've got two of those and they're still sitting in a drawer. The four holes they drilled in them conflict with the holes in the backplate adapter I have. The adapter is a 5" D1-4 and the pre-drilled holes on the Grizzly spider are poorly spaced, at least for my backplate. Good luck on yours, hope it works for you.

linekin
12-07-2018, 05:46 AM
Pete, the lathe at work I'm most comfortable with spindle is about a ft too long. I tried between centers but it didn't go well due to vibration. So I made a bushing. Turned the uncut barrel O.D. true with each end of the bore & slid it into the spindle. Worked well for me.
I've since bought a Heavy 10 & have yet to make a spider for it. I wonder if I could adapt what you found for it. Can't build one for $30. Got 2 barrels coming so need to figure out something. Thanks for the heads up!
Keith

Jim Kobe
12-07-2018, 10:15 AM
I made mine to thread right on the spindle. I used the face plate as a pattern, made a male thread to match the thread on the faceplate's spindle thread and then threaded the spider. That way I didn't have to remove the spider to check for fit AND, I only have one lathe.

Pete Wass
12-07-2018, 03:26 PM
Pete, the lathe at work I'm most comfortable with spindle is about a ft too long. I tried between centers but it didn't go well due to vibration. So I made a bushing. Turned the uncut barrel O.D. true with each end of the bore & slid it into the spindle. Worked well for me.
I've since bought a Heavy 10 & have yet to make a spider for it. I wonder if I could adapt what you found for it. Can't build one for $30. Got 2 barrels coming so need to figure out something. Thanks for the heads up!
Keith

I ain't home, I have a spider I made for my 10-L sitting in my shop you would be welcome to. It slips over the outboard end of the spindle and is held by 3 grub screws. Somehow I was able to get it fitted to a nice slip fit so it doesn't wobble any. If you can hold off until April, it's yurn.

Pete

Pete Wass
12-07-2018, 03:29 PM
I've got two of those and they're still sitting in a drawer. The four holes they drilled in them conflict with the holes in the backplate adapter I have. The adapter is a 5" D1-4 and the pre-drilled holes on the Grizzly spider are poorly spaced, at least for my backplate. Good luck on yours, hope it works for you.

I have a D1-4 machine as well. Perhaps the mother of invention will present herself?

Pete

Pete Wass
12-07-2018, 03:38 PM
Before I left, I looked through the tooling I have and thought perhaps I could use my ER-40 collet chuck as a backer for a Spider. I had a nice piece of 7075 - 5" by 2 1/2" thick and arbitrarily decided to drill 3 holes through the face of it after I carefully bored it to fit over the threads on the collet holder. Fine, that would work lovely EXCEPT, one of the radial holes was going to interfere with one of the three holes I had drilled for mounting the chunk to the face of the collet holder, I couldn't seem to make it work out, just looking. Perhaps if one of the spider adjusting screws was smaller than the others?, so I sat it on a shelf. Looking like another dry hole coming up!

Pete

NezRongero
12-07-2018, 04:46 PM
Those Bald Eagle spiders work well. I had to drill new mounting holes. For nuts I just used those 3/8 unistrut nuts to secure the spider to the faceplate. They are long enough to straddle the ribs behind the slots.

The spider is in there sort of permanently since I have the compound set on this 1024 for taper boring dedicated for chambering AR15 barrels.

Pete Wass
12-07-2018, 05:15 PM
Looks like something can be worked out :).

Pete

adamsgt
12-07-2018, 11:08 PM
Those Bald Eagle spiders work well. I had to drill new mounting holes. For nuts I just used those 3/8 unistrut nuts to secure the spider to the faceplate. They are long enough to straddle the ribs behind the slots.

The spider is in there sort of permanently since I have the compound set on this 1024 for taper boring dedicated for chambering AR15 barrels.

I see you used a faceplate whereas I tried to use a back plate adapter. Mine came from CDCO and we all know the quality of that stuff. Anyway, I may still be able to get it to work with some judicious carving on the adapter. OK, after cranking my neck sideways I can see the original holes you didn't use. Another way to skin the cat. OOPS, PETA just said I can't use that term.

linekin
12-08-2018, 04:25 PM
I ain't home, I have a spider I made for my 10-L sitting in my shop you would be welcome to. It slips over the outboard end of the spindle and is held by 3 grub screws. Somehow I was able to get it fitted to a nice slip fit so it doesn't wobble any. If you can hold off until April, it's yurn.

Pete

Thanks Pete, but although I can exhibit patience at times, not for that looooonng!
Hope you're feeling better!
Keith

Pete Wass
12-08-2018, 11:19 PM
Thanks Pete, but although I can exhibit patience at times, not for that looooonng!
Hope you're feeling better!
Keith

Thanks, yes, I am almost back to snuff I believe.

Pete

adamsgt
12-09-2018, 12:01 AM
Looks like something can be worked out :).

Pete

Took another look at the spider/adapter situation and think I can make it work. There are three holes on the back and near the edge of the adapter that appear to be for a 9mm socket head screw. I'm assuming those are to bolt on a chuck. As the spider is flat on both sides I'll machine off the boss on the face of the adapter and drill and tap three holes in the back of the spider to connect the two. A little tricky trying to find a position where the holes in the adapter won't interfere with the bolts in the spider but I think i'll have enough clearance. Alternatively, I could cut a recess in the back of the spider to mate with the boss on the adapter. Might be better to cut the aluminum of the spider rather than the cast iron of the adapter.

MilGunsmith
12-09-2018, 05:48 AM
If you can cut the recess for the adapter boss, you will be able to use smaller and less bolts as the boss will be aligning and supporting the spider.

adamsgt
12-09-2018, 01:41 PM
If you can cut the recess for the adapter boss, you will be able to use smaller and less bolts as the boss will be aligning and supporting the spider.

Yeah, I was thinking that. I think I was just trying to get away from mounting my four jaw chuck.

Thanks

MilGunsmith
12-09-2018, 05:25 PM
The 4 jaw chuck is on my lathe the most. Use that or collets. It doesn't take long to indicate in your work if you do it enough. The trick is to use two chuck keys at the same time, one tightens while the other loosens. Been doing it that way for 40 years. It also keeps the non machinists from using the lathe😊

adamsgt
12-09-2018, 09:52 PM
The 4 jaw chuck is on my lathe the most. Use that or collets. It doesn't take long to indicate in your work if you do it enough. The trick is to use two chuck keys at the same time, one tightens while the other loosens. Been doing it that way for 40 years. It also keeps the non machinists from using the lathe😊

Helluva trick.:cool: You talked me into mounting the 4 jaw. Now I gotta get me another chuck key.

Pete Wass
12-10-2018, 04:29 PM
is to get away from the stick out to allow more length through the spindle. My 4 jaw is very thick and the backing thick. I don't have any issues with using a 4 jaw chuck regarding indicating things in , its just that its too much of a good thing in my circumstances.

Pete

adamsgt
12-10-2018, 10:38 PM
is to get away from the stick out to allow more length through the spindle. My 4 jaw is very thick and the backing thick. I don't have any issues with using a 4 jaw chuck regarding indicating things in , its just that its too much of a good thing in my circumstances.

Pete

The Grizzly spider mounted on a adapter will be much thinner than a four jaw chuck. I Think I've found a position where I can use the socket bolt holes on the back of the adapter to bolt through to the spider. The holes on the adapter appear to be M8. I bought three M8 1.25 30 bolts at Ace Hardware and will have the M6.8 tap drill tomorrow to drill and tap the holes for the bolts. The only decision left is whether to machine the boss off the adapter or cut a recess on the back of the spider. Machining off the boss would be easier and faster and I think the three bolts would secure the spider. That spider isn't going to be rotating that fast anyway. However, I do see the advantage of retaining the boss as the adapter could be used to mount something else, if needed. Another however, those adapters don't cost all that much at CDCO as they're only $42 for the five inch D1-4. I'll make the decision when I try to lift the four jaw. Just to clarify, my reference to the four jaw is to use it to hold the Grizzly spider to cut the recess, if I go that route.

Pete Wass
12-11-2018, 11:03 AM
It's amazing how they are able to sell that for $35.! Even thought freight was $10. which is outrageous! It's almost prohibitive to buy things now if they need to be shipped. It ain't that I can't afford the ten bucks but it's the principal that an additional 20 some percent musdt be added to get it here. Ridiculous!

Tennyrate, I've got until mid April to stew about it.

Pete

adamsgt
12-11-2018, 12:29 PM
It's amazing how they are able to sell that for $35.! Even thought freight was $10. which is outrageous! It's almost prohibitive to buy things now if they need to be shipped. It ain't that I can't afford the ten bucks but it's the principal that an additional 20 some percent musdt be added to get it here. Ridiculous!

Tennyrate, I've got until mid April to stew about it.

Pete

Yeah, I wanted to order something from MSC that cost about $10 and they wanted $12.95 shipping. Brownells has a shipping option called Edge. It costs 49.95 per year and that's it. It includes 2 day delivery. With this option I don't have to wait to build up and order to amortize the shipping costs. If I need just one little thing I order it. So far I'm ahead of the game with them.

retired
12-11-2018, 03:17 PM
this is just under 2" thick
if i had a counterbore the screws would not be exposed
a small safety issue

Pete Wass
12-11-2018, 03:47 PM
this is just under 2" thick
if i had a counterbore the screws would not be exposed
a small safety issue

What I had in mind. I was thinking One could make plugs for the existing holes in the Grizzly and flip the spider to minimize the visual effect of the plugged holes. I had also thought of countersinking screws from the back side of the plate to hide them. I do have a good 5/16 counterbore so I can do that.

Pete

Wayne Shaw
12-12-2018, 05:24 AM
this is just under 2" thick
if i had a counterbore the screws would not be exposed
a small safety issue

Is that a backplate for a set true chuck?

Pete Wass
12-12-2018, 09:05 AM
Yeah, I wanted to order something from MSC that cost about $10 and they wanted $12.95 shipping. Brownells has a shipping option called Edge. It costs 49.95 per year and that's it. It includes 2 day delivery. With this option I don't have to wait to build up and order to amortize the shipping costs. If I need just one little thing I order it. So far I'm ahead of the game with them.

Not a bad plan except I don't buy much from Brownells.

Pete

retired
12-12-2018, 10:40 AM
i think so. it was long ago.
inexpensive from shar's or cdco
turned it down on the od , and then the step till close to the studs.
sleeved the id and d/t thur both for the bolts.
the tipped bolts are from grizzly.


Is that a backplate for a set true chuck?

Wayne Shaw
12-12-2018, 04:32 PM
i think so. it was long ago.
inexpensive from shar's or cdco
turned it down on the od , and then the step till close to the studs.
sleeved the id and d/t thur both for the bolts.
the tipped bolts are from grizzly.

With the raised center, thatís where the adjustment bolts push against for a set true. You took advantage of it and tapped your holes in it, instead of drilling through the entire radius to the hole.

retired
12-12-2018, 04:47 PM
yes no bolt hole alignment issues between mounting lugs/studs and the 4 adjusting bolts.

With the raised center, thatís where the adjustment bolts push against for a set true. You took advantage of it and tapped your holes in it, instead of drilling through the entire radius to the hole.

adamsgt
12-12-2018, 10:48 PM
Not a bad plan except I don't buy much from Brownells.

Pete

I've ordered cases .22 ammo from them under that program. I buy a lot of stuff for AR's, 1911's. If you haven't visited their site for a while, they're even selling firearms. As with any of these dealers you gotta shop prices.

adamsgt
12-12-2018, 11:06 PM
What I had in mind. I was thinking One could make plugs for the existing holes in the Grizzly and flip the spider to minimize the visual effect of the plugged holes. I had also thought of countersinking screws from the back side of the plate to hide them. I do have a good 5/16 counterbore so I can do that.

Pete

The holes on the back of the adapter I'm using are countersunk. So, i'll be drilling and tapping the back of the spider. The M8 1.25 30mm fit perfectly in the adapter and 30mm length on the screws will be just right. I hefted the four jaw last night and it's not that heavy, so I'll go ahead and carve the recess in the back of the spider. Don't think I'll worry about the unused holes in the spider. Function over form.

Pete Wass
12-13-2018, 12:31 PM
The holes on the back of the adapter I'm using are countersunk. So, i'll be drilling and tapping the back of the spider. The M8 1.25 30mm fit perfectly in the adapter and 30mm length on the screws will be just right. I hefted the four jaw last night and it's not that heavy, so I'll go ahead and carve the recess in the back of the spider. Don't think I'll worry about the unused holes in the spider. Function over form.

I don't do Youtubes or have an audience when I'm working on my lathe so whatever works is my mantra.

Pete