Please school me on A1-5 mount!

[zamboni2354]

Hey guys,

The lathe i agreed to purchase I believe is an A1-5 mount. I've never had one. In googling it looks like it's the same size and taper as the D1 cam lock chucks but it bolts to the spindle.

Also, the A1 has bolts inside the taper and outside. An A2 has them just on the outside, so i could use an A2-5 chuck?I think?

With this type of spindle do you have to get specific chucks made for the A1 so that they have holes for the bolts to go thru? Or can you still get like any plain chuck and just get the A1-5 back plate? For example, I have a bison 6 jaw chuck with an L00 back plate, can I just get the A1 back plate for it?

Thanks

Jeff in long beach

Sent from my LM-V405 using Tapatalk

 

[Martin W]

This might help?
Cheers
Martin

• Home
• Resources
• Lathe Spindle Nose Identification Chart

Lathe Spindle Nose Identification Chart
Review the diagrams below to determine your spindle nose type. Analyze the corresponding chart and make the required measurements. Select the spindle nose size for your chuck or adapter plate.

Type D - Camlock
Camlock pins are made with a D shape cutout on its body. They are used to mount a chuck to a lathe spindle.

D1-3 to D1-4 chucks and adapter plates have 3 camlock pins.
D1-5 to D1-15 chucks and adapter plates have 6 camlock pins.

To mount a chuck, a lathe operator inserts a chuck’s camlock pins into the lathe spindle, and using a wrench to rotate a cam inside the spindle, the operator pulls the camlock pins inward to snug the chuck tightly against the spindle.

Spindle Nose Size	A	B	C	D	E	F
D1-3	92	53.983	11	32	3x15.1	70.6
D1-4	117	63.521	11	34	3x16.7	82.6
D1-5	146	82.573	13	38	6x19.8	104.8
D1-6	181	106.385	14	45	6x23	133.4
D1-8	225	139.731	16	50	6x26.2	171.4
D1-11	298	196.883	18	60	6x31	235
D1-15	403	285.791	19	70	6x35.7	330.2
D1-20	546	412.795	21	82	6x42.1	463.6

Type A1 - Short Taper
Tapped holes on outer-bolt circle and tapped holes on inner-bolt circle.

Spindle Nose Size	A	B	C	D	E1	F1	E2	F2
A1-5	133.4	82.575	14.288	22.2	11x7/16-14 UNC	104.8	8x7/16-14 UNC	61.9
A1-6	165.1	106.390	15.875	25.4	11x1/2-13 UNC	133.4	8x1/2-13 UNC	82.6
A1-8	209.5	139.735	17.462	28.6	11x5/8-11 UNC	171.4	8x5/8-11 UNC	111.1
A1-11	279.4	196.885	19.05	34.9	11x3/4-10 UNC	235	8x3/4-10 UNC	165.1
A1-15	381	285.8	20.638	41.3	12x7/8-9 UNC	330.2	11x7/8-9 UNC	247.6
A1-20	520	412.8	22.225	47.6	12x1-8 UNC	463.6	11x1-8 UNC	368.3

Type A2 - Short Taper
Tapped holes on outer-bolt circle, no holes on inner-bolt circle.

Spindle Nose Size	A	B	C	D	E1	F1
A2-3	92.1	53.985	11.1	15.9	3x7/16-14 UNC	70.66
A2-4	108	63.525	11.1	19	11x7/16-14 UNC	82.55
A2-5	133.4	82.575	12.7	22.2	11x7/16-14 UNC	104.8
A2-6	165.1	106.390	14.3	25.4	11x1/2-13 UNC	133.4
A2-8	209.5	139.735	15.9	28.6	11x5/8-11 UNC	171.4
A2-11	279.4	196.885	17.5	34.9	11x3/4-10 UNC	235
A2-15	381	285.8	19	41.3	12x7/8-9 UNC	330.2
A2-20	520	412.8	20.6	47.6	12x1-8 UNC	463.6

Type L - Long Taper
For centering and locating fittings, a key for positive location, and a flanged retention nut.

Spindle Nose Size	A	B	C	D	Drive Key
L00	69.850	3 3/4-6 UNS	50.800	14.288	9.525x38.1
L0	82.550	4 1-2/-6	60.325	15.875	9.525x44.45
L1	104.775	6-6 UNS	73.025	19.050	15.875x60.32
L2	133.350	7 3/4-5 UNS	85.725	25.400	19.05x73.02
L3	165.100	10 3/8-4 UNS	94.425	28.575	25.4x82.55

Threaded

A	B	C	D	E	F
M 20	21	30	6.3	10	20
M 24	25	36	8	12	24
M 33	34	50	9	14	30
M 39	40	56	10	16	35
M 45	46	67	11	18	40
M 52	55	80	12	20	45
M 60	62	90	14	22	50
M 76x6	78	112	16	30	63
M 105x6	106	150	20	40	80

×
×

​

 

[kb58]

For my Bison 3-jaw chuck, I had to buy an "A2" adaptor to use with their "tru-align" series. For my Bison 4-jaw, it surprisingly has an integral A1 or A2 interface (can't remember which).

The irritation with the adaptor is that if you want to switch chucks, it means unbolting the chuck first, then unbolting the adaptor. Doing so loses chuck alignment, so switching to a 4-jaw always comes with the thought "do I really need to", when it shouldn't.

 

[zamboni2354]

This might help?
Cheers
Martin

​

Thanks martin, I found something like when I was googling. I appreciate it.

 

[JimDawson]

I've never seen a A1/2 spindle on anything but a CNC lathe. Normally the chucks are drilled for the bolt pattern and are direct mount.

 

[Winegrower]

Takisawa TSL-800 has a A1-5 spindle nose.

 

[bktmbill]

For my Bison 3-jaw chuck, I had to buy an "A2" adaptor to use with their "tru-align" series. For my Bison 4-jaw, it surprisingly has an integral A1 or A2 interface (can't remember which).

The irritation with the adaptor is that if you want to switch chucks, it means unbolting the chuck first, then unbolting the adaptor. Doing so loses chuck alignment, so switching to a 4-jaw always comes with the thought "do I really need to", when it shouldn't.

Hate to ask a dumb question but what do you mean " loses chuck alignment " . I have a Takasawa TSL 800 with and A1-5 to D16 adapter . Don't like the adapter because it sticks the chucks out to far and takes away the gap bed provision. I currently have a three jaw and faceplate but still need a 4 jaw. Also do I have to remove the 4 5/16 allens that are shown through machines front plate to get adapter off. Just wondering going forward what my best options are. Don't have any experience with adapters any help or ideas would be appreciated. Thanks

 

[Winegrower]

On my Takisawa, the three jaw is attached to a (backing plate, I suppose) with three bolts that insert from the back of the plate into the chuck. You take those off, then the plate is bolted to the spindle with I think 4 bolts. Then, the 4 jaw (a Cushman) bolts directly to the spindle. As does the collet closer.

A complexity is that the three bolts into the backing plate will only come out at one rotation point where there's a cutout in the casting for that purpose.

It's a little bit of an exercise, with the hardest part being aligning the chuck with the back plate EXACTLY so the bolts will screw in. It's a blind kind of operation. I've started not completely seating the chuck so I can see the bolt alignment while starting.

I love the lathe, but this is it's worst feature.

 

[Choiliefan]

Back when I had an A1-6 lathe, both the 3 and 4 jaw chucks bolted directly to the spindle from the front. Due to the scroll, the 3-jaw used the smaller bolt circle.
The Jacobs Rubberflex collet chuck had to be disassembled to mount/remove because of the handwheel. Otherwise, not a big deal. Lathe was a Japanese Tuda-Max 15X42.